Foryoueats: Blackberry Muffins

Ingredients

• 2 1/2 cups (320g) all-purpose flour
• 1 tablespoon baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon salt
• 1/2 teaspoon cinnamon
• 1 cup (200g) sugar
• 2 large eggs
• 1 cup(236ml) sour cream
• 8 tablespoons (1 stick, 112g) warm melted unsalted butter
• 1 teaspoon milkor water
• 1 teaspoon vanilla
• 2 cups (300g) fresh blackberries, halved