Banana Pecan Caramel Layer Cake

Preheat Oven: Preheat your oven to 350°F (175°C). Grease and flour three 9-inch round cake pans.
Prepare the Cake: In a medium bowl, whisk together flour, baking powder, baking soda, and salt. Set aside. In a large mixing bowl, beat the butter, granulated sugar, and brown sugar together until light and fluffy. Add eggs one at a time, beating well after each addition. Mix in the vanilla extract and mashed bananas. Gradually add the flour mixture, alternating with the buttermilk, beginning and ending with the flour mixture. Fold in the chopped pecans.
Bake the Cake: Divide the batter evenly among the prepared pans. Smooth the tops with a spatula. Bake for 25-30 minutes, or until a toothpick inserted into the center of the cakes comes out clean. Let the cakes cool in the pans for 10 minutes, then turn them out onto wire racks to cool completely.