Preheat the oven to 350 degrees.
Prepare your cake pans by cutting a parchment round for the bottom of each pan. Add cooking spray to the pan, then place the parchment piece on the bottom. Set aside.
In a large mixing bowl, combine all of the dry ingredients (flour, sugar, cinnamon, baking soda and salt). Whisk them together until well combined.
Next, add all of the wet ingredients (mashed bananas, crushed pineapple (with juice), vanilla extract, eggs and oil). Use a hand or a stand mixer to mix the batter until it is combined (do not over mix). Scrape down the bowl with a rubber spatula.
Fold in the chopped pecans with the spatula.
Evenly separate the batter into 3 prepared 9" cake pans. Use a kitchen scale if you have it to ensure batter is equal.
Bake for 18-24 minutes or until a toothpick comes out clean. Allow the cakes to cool completely before assembling. **for best results, freeze the cake layers before assembling the cake**