In blender or food processor, combine bananas, peanut butter, eggs and baking powder; blend until smooth. Fold in blueberries by hand.
Pour mixture into muffin tin. Bake 12-15 minutes.
Store in airtight container up to 3 days.
Notes
Nutritional information per serving: 155 calories, 10 g carbohydrates, 31 mg cholesterol, 2 g saturated fat, 9 g unsaturated fat, 2 g fiber, 6 g protein, 98 mg sodium, 5 g sugar.