Preheat the oven to 350°F. **Lightly oil three 9” cake pans with coconut oil. Using 9” cake pan parchment rounds on the bottom of each pan is helpful too.
In a large mixing bowl, whisk together the flour, sugar, baking soda, baking powder, salt, and cinnamon.
Add the eggs, oil, and vanilla extract. Stir until the dry ingredients are incorporated.
Add the crushed pineapple, mashed bananas, and pecans. Stir until combined. Do not over stir. The batter will be thicker than traditional cake batter.
Divide the batter evenly among the three cake pans. Use a spatula or spoon to smooth the tops of the layers in each pan.
Bake for 35-45 minutes. If your cake pans are light colored, they will need to bake for closer to 45 minutes. The cakes should bounce back when pressed gently and a toothpick inserted into the center of each cake should come out clean or with dry crumbs. (Internal temperature 200° F)
Place the pans on a cooling rack and allow them to cool for 10-15 minutes, then remove the cakes from the pans and allow them to cool completely before frosting them.