Preheat your oven to 375°F.
While the oven preheats, pulse the banana and carrot together in a food processor. Your batter may have small chunks of carrot and not be entirely smooth. This is normal. (And delicious!)
1 cup ripe bananas, ¾ cup carrots
In a mixing bowl, combine the dry ingredients, except the sugar. Set side.
1 teaspoon baking soda, 1 teaspoon baking powder, ½ teaspoon salt, 2¼ teaspoon pumpkin pie spice, 2 cups all purpose flour
In a large mixing bowl, beat together the eggs and other wet ingredients. Then, mix in the sugar.
2 large eggs, ½ cup packed brown sugar, 1 teaspoon vanilla extract, ⅓ cup vegetable oil
Gently stir the flour mixture into the wet ingredients until just combined. Take care not to overmix.
Line a muffin tin with paper liners and pour the batter evenly into each well until they are about ⅔ full.
In a small bowl, mix together the topping ingredients. Sprinkle it over the top of the muffins.
2 tablespoons light brown sugar, ¼ cup quick cooking oats
Bake 13-15 minutes or until a knife inserted comes out clean.