Preheat oven to 350° F. Prepare cake pans using cooking spray and parchment circles.
In a mixing bowl, combine all-purpose flour, baking powder, baking soda, salt, and cinnamon. Whisk to combine and set aside.
In a large mixing bowl, combine brown sugar, granulated sugar, vegetable oil, eggs, and vanilla, and whisk together until fully combined.
Add in mashed banana and pineapple and mix until well combined.
Add in the dry ingredients and mix with a spatula until the dry ingredients and wet ingredients are combined.
Fold in the chopped pecans until well dispersed throughout the batter.
Divide batter evenly between your cake pans. Use a kitchen scale to ensure that the batter is equally divided.
Bake cakes for approximately 30-35 minutes in the oven until the cakes spring back when gently touched or toothpick comes out clean. *Please note that baking times may be slightly different for different size pans.
Remove cakes from the oven and allow them to cool in the pans on a wire rack for about 20 minutes. Remove the cake layers from the pan and transfer to a wire rack to cool to room temperature.