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Brown Sugar Frosting is the silky, caramel-kissed frosting that tastes like the inside of a chocolate chip cookie, and the secret is a cooked flour base that makes it ultra smooth instead of gritty. I whipped up a batch one rainy afternoon and Maddie licked the beater clean before I could pipe a single cupcake. If you love a dreamy homemade frosting, you will also love our chocolate cream cheese frosting.
This old-fashioned ermine-style frosting whips up light and fluffy with a rich brown sugar flavor.
Brown Sugar Frosting Quick Look
- 🕒 Prep Time: 10 minutes
- 🌡️ Cook Time: 5 minutes
- ⏳ Total Time: 15 minutes
- 🍽️ Serving: 12 servings
- ⚡ Calories: 230kcal
- 🌶️ Flavor Profile: Light, fluffy, and buttery with deep caramel brown sugar notes
- ✋ Difficulty: Easy, just cook, cool, and whip, like our chocolate cream cheese frosting
Quick Answer
Whisk flour into milk in a saucepan, then cook over medium heat, stirring constantly, until thick and smooth. Whisk in vanilla and let the paste cool completely to room temperature. Separately, whip softened butter until smooth, beat in brown sugar a little at a time, and whip on high for 10 minutes until the graininess is gone. Add the cooled milk paste and whip 3 more minutes until light and fluffy like whipped cream.
Jump to:
- Brown Sugar Frosting Quick Look
- Quick Answer
- Why This Recipe Works
- Why You’ll Love This Recipe
- Key Ingredients
- Variations and Substitutions
- How to Make Brown Sugar Frosting
- Recipe Tips & Tricks
- Serving Ideas and Suggestions
- Brown Sugar Frosting FAQs
- Other Recommended Frostings and Desserts
- Brown Sugar Frosting
Why This Recipe Works
Click to see the technique science
- A cooked flour base is the secret. This ermine-style method dissolves the sugar into a silky base, so the frosting is never gritty.
- Brown sugar brings caramel flavor. Light brown sugar gives a deep, molasses-kissed flavor you cannot get from white sugar.
- Whipping makes it fluffy. A long whip on high speed beats in air for a light, whipped-cream-like texture.
- It is not too sweet. Unlike powdered-sugar buttercream, this frosting is rich but balanced, never cloying.
- It pipes beautifully. The smooth, stable texture holds its shape for gorgeous swirls on cakes and cupcakes.
Why You’ll Love This Recipe
- The cooked-flour method makes it perfectly smooth, never gritty.
- It has a rich caramel flavor without being overly sweet.
- It pipes and spreads beautifully, perfect for our chocolate chip pound cake and cupcakes.
Key Ingredients
You only need five simple ingredients for this brown sugar frosting. See the recipe card below for exact amounts.
- Light brown sugar: The star, giving the frosting its caramel flavor and color. Pack it firmly when measuring.
- Unsalted butter: Softened to room temperature so it whips up light and fluffy.
- Whole milk and flour: Cooked together into a smooth paste that is the secret to a non-gritty frosting.
- Vanilla extract: Rounds out the flavor with warm, sweet notes.
- That is it: No powdered sugar needed, which is what keeps this frosting silky and not too sweet.
See recipe card for exact quantities.
Variations and Substitutions
This brown sugar frosting is easy to customize. Here are a few ideas.
- Add a pinch of salt: A little salt makes it taste like salted caramel.
- Spice it up: Add a pinch of cinnamon or a splash of maple for a fall twist.
- Make it boozy: Whip in a teaspoon of bourbon or rum.
- Brown butter version: Use browned, cooled butter for an even deeper, nutty flavor.
- Pair it with our chocolate chip pound cake for the ultimate treat.
How to Make Brown Sugar Frosting
- Whisk milk and flour. Whisk the flour into the milk in a saucepan, a little at a time, until smooth and lump-free.
- Cook until thick. Cook over medium heat, stirring constantly, until thickened and smooth, about 5 minutes. Take off the heat.
- Add vanilla and cool. Whisk in the vanilla and let the paste cool completely to room temperature.
- Whip the butter. In a stand mixer, whip the softened butter until smooth.
- Add the brown sugar. Beat in the brown sugar a little at a time, then whip on high 10 minutes until no graininess remains.
- Add the paste and whip. Add the cooled milk mixture and whip on high 3 more minutes until light and fluffy.
Recipe Tips & Tricks
- Cool the paste completely. Adding warm paste will melt the butter and ruin the texture, so be patient.
- Soften the butter. Room-temperature butter whips up far lighter than cold butter.
- Whip long enough. A full 10 minutes is what dissolves the sugar and gives that silky finish.
- Scrape the bowl often. Scraping ensures everything whips evenly with no lumps.
- Use light brown sugar. Dark brown sugar works for a stronger molasses flavor, but light keeps it balanced.
- Frost cooled cakes only. Frosting warm cakes will cause it to melt and slide.
Serving Ideas and Suggestions
This brown sugar frosting is incredible on just about any cake or cupcake. It is a natural match for spice cake, banana cake, pumpkin cupcakes, and of course chocolate chip pound cake.
Use it to fill and frost layer cakes, pipe swirls on cupcakes, or sandwich between cookies. It is delicious on our chocolate chip pound cake or alongside our chocolate cream cheese frosting on a dessert table.
This recipe makes enough to generously frost 12 cupcakes or fill and frost an 8-inch layer cake. Store frosted desserts in the fridge and bring to room temperature before serving for the best texture.
Brown Sugar Frosting FAQs
Graininess usually means the sugar did not fully dissolve. Whip the butter and brown sugar on high for the full 10 minutes, and make sure your flour paste is smooth and cooled before adding.
Ermine frosting, also called boiled-milk or flour frosting, uses a cooked milk and flour paste instead of powdered sugar. It is silky, light, and less sweet, and this brown sugar version is a delicious twist on it.
Yes. Store it in an airtight container in the fridge for up to 5 days. Let it come to room temperature and re-whip briefly before using to bring back the fluffy texture.
Yes. Once properly whipped it is smooth and stable enough to pipe swirls and decorations. Keep it cool, and if it softens, chill it briefly and re-whip.
You can. Dark brown sugar gives a stronger molasses flavor and slightly darker color. Light brown sugar keeps the flavor balanced and the color lighter.
It makes about enough to frost 12 cupcakes or fill and frost a small layer cake. Double it for a tall, generously frosted layer cake.
Need something to frost? Try our chocolate chip pound cake next.
Love a buttery cake? Try our chocolate chip pound cake.
Brown Sugar Frosting
Ingredients
- 1 cup whole milk
- 5 tablespoons all-purpose flour
- 1 teaspoon vanilla extract
- 1 cup unsalted butter softened
- 1 cup light brown sugar packed
Instructions
- Add the milk to a small saucepot.1 cup whole milk
- Add the flour a little at a time, whisking it in completely to avoid lumps.5 tablespoons all-purpose flour
- Place over medium heat, stirring constantly, until thickened and smooth, about 5 minutes. Take off the heat.
- Whisk in the vanilla and allow to cool to room temperature.1 teaspoon vanilla extract
- In the body of a stand mixer with the whisk attachment, whip the butter until smooth.1 cup unsalted butter
- Add the brown sugar a little at a time until it’s fully incorporated, scrape down the sides.1 cup light brown sugar
- Turn the mixer on high speed and whip for 10 minutes, scraping often. There should be little to no graininess left.
- Add the milk mixture and whip on high for 3 more minutes until light and fluffy, like a whipped cream consistency.
Notes
- The milk-flour base should come to room temperature before adding it to the butter mixture.
- Use a rubber spatula to scrape the sides of the bowl (and the bottom of the bowl, too) so everything blends evenly.
- Don’t be afraid to let your mixer run on medium speed or even medium-high for a few minutes.
- If it’s too sweet, add a pinch of salt. If it’s not sweet enough, toss in a little more light brown sugar—but do it gradually.
- If the consistency is too stiff, add a teaspoon of milk at a time.
- This frosting is sturdy enough for piping with a pastry bag if you want fancy swirls on cupcakes.
Nutrition
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