Preheat the oven to 350 degrees F (175 degrees C). Grease a 12-cup muffin tin with cooking spray.
Mix banana, butter, egg, and coconut oil together in a large bowl until well combined. Add zucchini and vanilla; mix well.
Combine flour, baking soda, cinnamon, nutmeg, and salt in a separate bowl. Gradually add flour mixture to zucchini mixture, stirring until well combined. Slowly stir in milk until incorporated. Scoop 1/4 cup batter into each prepared muffin cup. Sprinkle each muffin with 1 teaspoon brown sugar.
Bake in the preheated oven until the tops spring back when lightly pressed, about 20 minutes.
Nutritional Facts
Per 12 servings
Calories: 136
Carbohydrate: 18g
Fat: 6g
Fiber: 3g
Protein: 4g
Sugar: 2g
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