Preheat the oven to 350˚F and spray a 12-count muffin tin with non-stick spray.
In a medium bowl, whisk the flour, baking soda, cinnamon, ginger, nutmeg and salt together. Set aside.
In a large bowl combine sugar, brown sugar, olive oil, butter and eggs. Whisk for about 2 minutes, or until smooth and well combined. Add banana, pumpkin and vanilla and whisk until combined.
Add dry ingredients to the wet ingredients and fold together with a spatula until no streaks of flour remain. Fill each muffin cavity about ¾ full, then bake for about 18-20 minutes, or until a toothpick inserted in the center comes out clean.
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Notes
Storage: Store these muffins in an airtight container at room temperature for up to 3 days. Freezing: Place the cooled muffins into a freezer bag or airtight container and store in the freezer for up to 3 months. When ready to eat, let them thaw at room temperature or warm them up in the microwave for 15 seconds at a time until they’re heated through.