Homemade banana zucchini bread

melted butter, plus more for coating your pan

canola oil

all purpose flour

sugar

salt

baking soda

very ripe bananas, mashed

grated zucchini

buttermilk (or you can make your own by combining ¼ milk and ¾ tsp lemon juice, let sit for 5 min before using in the recipe)

large eggs

vanilla extract