Warm skillet:
Warm a large nonstick or well-seasoned cast iron skillet over medium to medium-low heat.Mash banana:
Thoroughly mash the banana until nearly smooth; aim for about 1/2 cup.Beat in egg:
Beat in the egg until well combined.Mix in flour:
Mix in the flour just until no dry streaks remain.Fold in blueberries:
Carefully fold in the blueberries; avoid overmixing.Melt butter:
Add a small amount of butter or oil to the skillet and let it melt.Cook pancakes:
Drop batter by 2-tablespoon portions (a cookie scoop works well) into the skillet. Cook until edges look set, roughly 2-3 minutes.Flip and finish:
Flip and cook until fully done, about 2 more minutes.Cool before serving:
Allow pancakes to cool before serving to a baby.