This is a good and easy, no fail recipe for some berry muffins. Works with Blueberries as well.
By Elise bauer at Simply Recipes
2 1/2 cups all purpose flour
1 Tbs baking powder
1/2 Tsp baking soda
1/2 Tsp salt
1/2 Tsp cinnamon
2 large eggs
1 cup sour cream
1 Tsp milk
1 cup sugar
8 Tbs warm melted butter
1 Tsp vanilla
1 1/2 cups of blackberries, fresh or frozen (if using fresh berries, cut them in half, if using frozen berries, defrost first, drain excess liquid, then coat them lightly in flour)