From http://allrecipes.com/Recipe/Blueberry-Cream-Muffins/Detail.aspx, with my personal tweaks in italics.
1 cup brown sugar
1 cup raw sugar
1 cup vegetable oil
1 teaspoon vanilla extract
2 cups all-purpose flour
1cup oat flour
1 cup oats
1 teaspoon salt
1 teaspoon baking soda
2 cups yogurt
2 cups mulberries
1.Preheat oven to 400 degrees F (200 degrees C). Grease 24 muffin cups or line with paper muffin liners.
2.In large bowl beat eggs, gradually add sugar while beating. Continue beating while slowly pouring in oil. Stir in vanilla and yogurt. Sift together flour, salt and baking soda.
3.Stir dry ingredients into egg mixture. Gently fold in blueberries. Scoop batter into prepared muffin cups.
4. Mix 1/2 C sugar, 1/3 C flour, 1/4 C butter, 1 t cinnamon until it looks like crumbs. Sprinkle appr. 1/2 T onto each muffin.
5.Bake in preheated oven for 20 minutes.