Blueberry Banana Muffins

Bahan-bahan (10 porsi)

• 1 ½ cups fresh blueberries
• 1 ½ cups all-purpose flour (+ 1 tablespoon to toss with blueberries )
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• ¼ teaspoon salt
• 1 cup mashed bananas (about 3)
• ½ cup granulated sugar
• ½ cup butter (melted)
• 1 egg (beaten)
• 1 teaspoon vanilla extract
• 1 cup powdered sugar
• 1 tablespoon fresh lemon juice (more as needed)
• 1 teaspoon melted butter