Blueberry Pancakes

INGREDIENTS

• 1/2 teaspoon vanilla extract
• 1 cup sour cream
• 1/2 teaspoon salt
• 2 large eggs
• 1/2 teaspoon lemon zest
• 2 tablespoons sugar
• 1 1/2 cups fresh or frozen blueberries
• 1 3/4 cups all-purpose flour
• 1/2 teaspoon baking soda
• 1 teaspoon baking powder
• 1 cup milk, plus more if needed
• 1 stick butter, melted