Core the apples and cut them into fourths. Cut the fourths into thirds lengthwise. Set aside.
Place the butter into a large skillet over medium heat. Melt the butter, add in the brown sugar and cinnamon, stir to combine.
Add in the apples, stir to coat in the butter mixture and let cook, stirring occasionally until the apples are just fork tender, about 10 minutes.
Preheat the oven to 400°F.
Place the brown sugar, flour, and salt in a medium sized bowl. Mix to combine.
Dice up the butter in small pieces, add it to the flour mixture, and using your fingers (you can also use a pastry cutter) roll the butter into the flour until it forms a small pebble/sand consistency. Add in the chopped pecans and stir to combine.
Place the apples in an 8 or 9-inch oven safe dish.
Top with the crumble mixture.
Bake for 20-25 minutes until golden brown on the top and the apples are bubbly. Let cool slightly, serve with ice cream and more chopped pecans for garnish if desired.
Video
Notes
You can use any good baking apple of your choosing, for this recipe we used Granny Smith. See my notes above for other apple suggestions.
This recipe can be frozen, see my tips above.
We like to top this with pecans, but other nuts can be substituted as well or omitted all together.
We made this in a pie plate but another good option would be a cast iron skillet or any 8" or 9" baking dish.
This can be doubled, to do this double the whole recipe and bake in a 9"x13" baking dish.
Top with ice cream, caramel sauce, butterscotch sauce, etc.