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Preheat oven to 350°F (175°C). Line or grease a muffin tin.
Mash bananas until smooth.
Add eggs and mix well until combined.
Add peanut butter and baking soda. Mix until smooth and thick.
Gently fold in blueberries.
Divide batter evenly into muffin cups.
Bake for about 20 minutes, until set with a few moist crumbs.
Let cool before removing from the pan. Bon appétit.