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Pumpkin slab pie is classic Thanksgiving pumpkin pie stretched onto a sheet pan, silky spiced filling, buttery crimped crust, and enough squares for the whole holiday table, and the first time I baked one on a chilly October Sunday the girls claimed the sugared crust leaves before the pie even cooled. If your crew starts begging for pumpkin everything the second September hits, my pumpkin cinnamon rolls belong on the same fall baking list.
One jelly roll pan turns pie for fifteen into a slice and serve dessert with zero pie dish juggling.
Pumpkin Slab Pie Quick Look
- 🕒 Prep Time: 15 minutes
- 🌡️ Cook Time: 40 minutes
- ⏳ Total Time: 55 minutes
- 🍽️ Serving: 15 servings
- ⚡ Calories: 405kcal
- 🌶️ Flavor Profile: Silky spiced pumpkin custard in a buttery, flaky crust
- ✋ Difficulty: Easy, on par with our one bowl pumpkin cake with bourbon praline frosting
Quick Answer
Stack 3 refrigerated pie crusts, roll them into a 12×18 inch rectangle, and fit the crust into a 10x15x1 jelly roll pan, trimming and crimping the edges. Whisk pumpkin puree, dark brown sugar, heavy cream, evaporated milk, eggs, vanilla, cornstarch, pumpkin pie spice, and salt until smooth, pour the filling into the crust, and bake at 400 degrees for 28 to 32 minutes until set. Cool completely, then slice into squares and garnish with baked pie crust cutouts and whipped cream.
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Why This Recipe Works
Click to see the technique science
- Stacking 3 crusts makes one sturdy shell. Rolling the crusts together builds a thicker pastry that holds a wet custard filling across a big pan without tearing or turning soggy.
- The shallow pan changes the ratio. A slab pie gives you more buttery crust per bite than a deep pie dish, which is exactly why crust lovers always come back for a second square.
- Cornstarch insures the custard. Two tablespoons thicken the filling so it slices into clean squares instead of weeping, even with all that cream and evaporated milk.
- Dark brown sugar deepens the flavor. The extra molasses plays up the caramel notes in the pumpkin, giving the pie a richer taste than white sugar ever could.
- Two milks beat one. Heavy cream brings richness while evaporated milk brings concentrated dairy flavor without extra water, the classic pumpkin pie combination scaled up for a crowd.
- A hot 400 degree oven sets it fast. The shallow filling cooks through in about 30 minutes, so the crust browns and the custard sets before either one can overbake.
Why You’ll Love This Recipe
- One pan serves fifteen people, so Thanksgiving dessert is done in a single bake.
- The filling is a dump and whisk custard, no stovetop cooking and no water bath.
- It delivers the same handheld pie joy as my pumpkin hand pies, with a fraction of the work per serving.
Key Ingredients
Everything here is pantry and fridge basics, and the can of pumpkin does the heavy lifting.
- Refrigerated Pie Crusts: The shell and the decorations. Stacking 3 crusts creates one strong slab base, and the 4th becomes the fall shaped cutouts.
- Pumpkin Puree: The star. Use pure pumpkin, not pumpkin pie filling, so you control the sugar and spice. Extra puree in the can? My pumpkin cornbread muffins will happily take it.
- Dark Brown Sugar: The sweetness. Its molasses depth makes the custard taste slow baked.
- Heavy Cream and Evaporated Milk: The silk. The two together set into the creamiest sliceable custard.
- Pumpkin Pie Spice: The warmth. Cinnamon, ginger, nutmeg, and clove in one spoonful. It is the same warm blend that flavors my pumpkin monkey bread.
See recipe card for exact quantities.
Variations and Substitutions
One big pie, plenty of ways to spin it.
- Maple version: Swap half a cup of the brown sugar for pure maple syrup for a deeper autumn flavor.
- Gingersnap accent: Scatter crushed gingersnaps over the cooled pie for crunch against the silky filling.
- Caramel apple mood: If your table splits between pumpkin and apple, my caramel apple cheesecake butter cake covers the other camp.
- Cranberry twist: Swirl the holiday in another direction with my white chocolate cranberry cheesecake bars on the same dessert board.
- Apple cider lane: My apple cider cake with brown sugar frosting is the sheet pan sibling for cider lovers.
- Spice it your way: No pumpkin pie spice? Use 1 teaspoon cinnamon plus 1/2 teaspoon each of ginger and nutmeg with a pinch of cloves.
How to Make Pumpkin Slab Pie
- Preheat the oven to 400 degrees. Lightly flour a clean work surface, unroll 3 of the pie crusts, and stack them on top of each other.
- Roll the stacked crusts out into a 12×18 inch rectangle.
- Place the crust into a 10x15x1 jelly roll pan and press it into the corners. Trim some of the excess and crimp the edges, then set aside.
- In a large bowl, add the pumpkin puree, brown sugar, heavy cream, evaporated milk, eggs, vanilla, cornstarch, pumpkin pie spice, and salt.
- Whisk everything together until the filling is completely smooth.
- Pour the filling into the crust and smooth out the top. Bake for 28 to 32 minutes until the filling is set and the crust is golden brown.
- Let the pie cool completely on a wire rack, the custard finishes setting as it cools.
- While the pie bakes, roll out the remaining crust and cut out fall themed shapes. Place them on a parchment lined sheet tray, brush with the egg wash, and sprinkle with decorator sugar.
- Bake the decorations for 8 to 10 minutes until golden brown and cool completely. Slice the cooled pie into squares and garnish with the crust shapes.
Recipe Tips & Tricks
- Roll the crust bigger than you think. A true 12×18 rectangle gives you enough pastry to climb the pan sides with some left to crimp, measure before you lift it.
- Do not skip the cornstarch. It is the difference between clean squares and a filling that slumps when you serve.
- Save the crust scraps. Trimmed edges become extra cutouts, the same buttery pastry trick behind my from scratch apple pie cupcakes.
- Chill the filling ingredients first. Cold cream and eggs whisk into a smoother custard, a trick I also lean on for my caramel apple pudding cups.
- Watch the center, not the timer. The pie is done when the middle barely jiggles as a whole, a wet wave means it needs a few more minutes.
- Cookie cutters are the shortcut. Small leaf and pumpkin cutters make the decorations look bakery level, just like the tops of my iced pumpkin oatmeal cookies.
- Cool completely before slicing. The custard needs to reach room temperature to cut into tidy squares, rushing it smears the first row.
Serving Ideas and Suggestions
This pumpkin slab pie was built for Thanksgiving, slide the whole pan onto the buffet and let everyone grab a square. A pillow of my stabilized whipped cream on every square is non negotiable in this house, it holds its swirl through the whole dessert hour.
For the full Thanksgiving spread, set it next to my sweet pumpkin cheese ball and a warm pan of my cranberry coffee cake so every kind of dessert person is covered.
It holds beautifully in the refrigerator, so bake it the day before and free up your oven for the turkey. Pudding fans get my creamy old fashioned rice pudding and my sticky toffee pudding on the same holiday table.
Squares travel well too, pack them in a container for potlucks, school events, or the neighbor who always asks for pie. And for the kids table, a plate of my chocolate glazed pumpkin donut holes disappears before the pie is even sliced.
More pumpkin baking to bookmark while the oven is hot: my pumpkin muffins with cream cheese, soft pumpkin chocolate chip cookies, and swirled pumpkin cupcakes all raid the same cozy spice cabinet.
And if pie is the theme this year, my mini pumpkin pies in a muffin tin are the party sized cousins of this slab, while my pecan pie cheesecake and caramel pumpkin sheet cake round out the holiday dessert board.
Pumpkin Slab Pie FAQs
Yes, pumpkin slab pie is a great make ahead dessert. Bake it up to 2 days before serving, cool it completely, then cover the pan and refrigerate. The custard actually slices cleaner after a night in the fridge. Add the crust decorations and whipped cream just before serving so they stay crisp and fluffy, and let the squares sit at room temperature for about 20 minutes to take the chill off.
Because the filling is a custard, pumpkin slab pie belongs in the refrigerator. Cover the pan with foil or move squares to an airtight container and refrigerate for up to 4 days. Keep the pastry decorations in a dry container at room temperature so they do not soften. Serve leftovers cold or let them come to room temperature, both ways are delicious.
Yes, pumpkin slab pie freezes surprisingly well. Cool it completely, cut it into squares, and wrap each one before tucking them into a freezer bag for up to 2 months. Thaw overnight in the refrigerator. The crust softens slightly after freezing, so a few minutes in a low oven refreshes it if you want that fresh baked feel. Freeze the pie without whipped cream and add it fresh at serving.
This pumpkin slab pie bakes in a 10x15x1 inch jelly roll pan, the shallow rimmed sheet pan that gives slab pie its name. A half sheet pan is too large for this amount of filling and a 9×13 baking dish is too deep. The 1 inch sides are what create that perfect crust to filling ratio and let the custard bake through in about 30 minutes.
Stick with pure pumpkin puree for this pumpkin slab pie. Canned pumpkin pie filling is already sweetened and spiced, so adding the brown sugar and pumpkin pie spice in this recipe would make it far too sweet. Pure puree lists one ingredient, pumpkin, and it lets the dark brown sugar and spice blend do their jobs in the right amounts.
Cracks in pumpkin slab pie almost always mean the custard overbaked. Pull the pan when the center barely jiggles, the residual heat finishes the set as it cools. Baking past that point squeezes moisture out of the eggs and the surface splits as it shrinks. The good news is a crack changes nothing about the flavor, and a swoosh of whipped cream covers it completely.
Made this pumpkin slab pie for your holiday crowd? Leave a comment and a star rating below, and tell me which crust shape disappeared first!
Pumpkin Slab Pie
Ingredients
- 3-4 refrigerated pie crusts divided use
- 30 ounces pure pumpkin puree
- 1 ¾ cups dark brown sugar
- 1 ½ cups heavy cream
- 1 cup evaporated milk
- 4 large eggs
- 1 tablespoon vanilla extract
- 2 tablespoons cornstarch
- 2 teaspoons pumpkin pie spice
- 1 teaspoon fine sea salt
Optional pie crust decoration:
- 1 large egg
- Splash of water
- Decorator’s sugar
Instructions
- Preheat the oven to 400°F.
- Lightly flour a clean work surface. Unroll and stack 3 pie crusts on top of each other. Roll it out into a 12×18 rectangle.
- Place the pie crust into a 10x15x1 jelly roll pan and form it into the pan. Trim off some of the excess crust and crimp the edges. Set aside.
- In a large bowl whisk together the pumpkin puree, brown sugar, heavy cream, evaporated milk, eggs, vanilla, cornstarch, pumpkin spice, and salt until smooth. Pour into the crust and smooth out the top.
- Bake for 28-32 minutes until golden brown on top, the crust is golden brown, and a toothpick inserted into the center comes out clean. Let cool completely on a wire rack.
- For optional crust decoration: While the pie is baking, unroll the remaining pie crust onto a lightly floured clean work surface. Using a cookie-cutter, or by hand cut out fall-themed shapes.
- Place the shapes onto a parchment paper-lined sheet tray. Beat the egg with a splash of water in a small bowl and brush the crust decorations lightly with the egg wash using a pastry brush. Sprinkle with decorator’s sugar.
- Bake for 8-10 minutes until golden brown. Cool completely.
- Once the pie is cooled to room temperature you can slice and serve with the pie crusts for garnish if using.
Notes
- You can make your own pie crust, make sure that it is a double pie crust recipe.
- Make sure you use canned pure pumpkin puree for this.
- Top with whipped cream, cool whip, caramel sauce, vanilla sauce or chocolate sauce.
- Light brown sugar can be replaced for the dark brown sugar.
- You can sub the evaporated milk with half and half or whole milk.
- This can be frozen, see above on how to do that.
Nutrition
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