Preheat the oven to 350° and spray a 9″ X 13″ cake pan with cooking spray.
cooking spray
In a large bowl combine flour, brown sugar, and salt.
2 1/2 cups flour, 1 1/2 cups brown sugar, 1/2 tsp salt
Cut the butter into the flour mixture using a pastry cutter until the mixture resembles coarse crumbs, set aside 1/2 cup of crumbs.
2/3 cup butter
Add the baking powder, baking soda, cinnamon and nutmeg to the remaining crumb mixture and stir to combine.
2 tsp baking powder, 1/2 tsp baking soda, 1/2 tsp nutmeg, 1/2 tsp cinnamon
Mix the well-beaten eggs into the buttermilk. Dump the egg mixture into the dry mixture all at once and stir until well combined. Pour batter into prepared pan.
2 eggs, 1 1/3 cups buttermilk
Add chopped nuts to the remaining crumbs and mix until combined. Sprinkle on top of cake batter and bake 25-35 minutes or until a toothpick inserted into the center comes out clean.
1/2 cup nuts
Allow to cool a bit and serve warm.