Blueberry Raspberry Oatmeal Muffins

Name: Blueberry Raspberry Oatmeal Muffins
Ingredients: 1 cup + 1 1/2 Tbsp. old fashioned or quick-cooking oats divided; 1/2 cup + 1 1/2 Tbsp. packed brown sugar divided; 1 cup fresh or frozen blueberries; 1 1/2 cups + 1 Tbsp. all-purpose flour divided; 1 Tbsp. baking powder; 1/4 - 1/2 tsp. cinnamon to taste; 4 Tbsp. melted butter; 1 cup nonfat raspberry yogurt (if you have a 6 oz. container you can use plain or vanilla yogurt or nonfat milk to bring it up to 1 cup); 1 egg; 1 teaspoon vanilla extract