Preheat oven to 375°F. Spray a 12-hole muffin pan with cooking spray or line with paper liners.
In a large bowl, combine baking mix, sugar and baking powder.
In a small bowl, combine the mashed bananas, apple sauce, peanut butter, egg and vanilla extract.
Add the wet ingredients to the dry ingrediients. Stir gently to combine.
Evenly spoon batter into prepared muffin pan. Bake for 18 to 20 minutes or until a toothpick inserted in the center comes out clean.
Remove the muffins from the pan and let cool on wire rack.
Sprinkle chopped peanuts on the top of each muffin before baking.