Blueberry Cornbread Muffins

Bahan-bahan (12 porsi)

• ¾ cup milk
• 1 tablespoon lemon juice, (plus 1½ teaspoons lemon zest, from 1 lemon)
• 1½ cups all purpose flour, (spooned into measuring cup and leveled-off)
• ½ cup yellow cornmeal
• ¾ cup sugar
• 2 teaspoons baking powder
• 1 teaspoon salt
• 1 cup blueberries ((see note))
• 2 large eggs
• 1½ teaspoons vanilla extract
• 1/2 cup (1 stick) unsalted butter, (melted)