Mix egg, milk, melted butter and vanilla. Add dry ingredients, stir just until dry ingredients are moistened.Add blackberries and fold gently. Fill greased muffin cups 2/3 full. Bake at 375°F for 20 to 25 minutes
1 cup fresh or frozen blackberries 1 egg 1/2 cup milk 1/4 cup butter, melted 1-1/2 cups flour 1/2 cup sugar 1/2 tsp vanilla 1/2 tsp salt 2 tsp baking powder