Secret to flat cakes: wet cake strips (i., Bake Even Strips) and wrap around the cake pans. They act as an insulator to help the cake bake evenly (flat). You can also use strips of towel: drench, wrap around the pans, and bake.
Brown Butter Pecan Cookies are thick, chewy, and crunchy!
I would substitute the flour for coconut flour an powdered sugar for a suitable substitue an it might be clean enough to eat Cinnamon Crumb Banana Bread. Because anything with a crumb topping is automatically delicious and always a good idea!