Ingredients

• 3/4 stick (6 tablespoons) unsalted butter, melted and cooled
• 1 cup packed light brown sugar
• 1/2 cup whole milk
• 1 large egg
• 1 1/2 cups all-purpose flour
• 1 1/2 teaspoons baking powder
• 1 teaspoon cinnamon
• 1/2 teaspoon salt
• 1 1/2 cups blueberries (7 1/2 oz)
• a muffin pan with 12 (1/2-cup) muffin cups; 12 foil or paper muffin liners

Instructions

1. Put oven rack in middle position and preheat oven to 400°F. Put liners in muffin cups.
2. Whisk together butter, brown sugar, milk, and egg in a bowl until combined well. Whisk together flour, baking powder, cinnamon, and salt in a large bowl. Add milk mixture and stir until just combined. Fold in blueberries gently.
3. Divide batter among muffin cups and bake until golden brown and a wooden pick inserted into center of a muffin comes out clean, 25 to 30 minutes.