1 cup regular oats
2 cups low-fat buttermilk
1 2/3 cups whole wheat flour
3/4 cup packed dark brown sugar
2 T. vegetable oil
1 tsp. baking powder
1 tsp. baking soda
1 tsp. salt
2 large eggs, lightly beaten
2/3 cup dried blueberries
Cooking spray

Combine oats and buttermilk in a medium bowl; cover and refrigerate overnight. Preheat oven to 350 degrees. Lightly spoon flour into dry measuring cups; level with a knife. Place buttermilk mixture, flour, and next 6 ingredients (flour through eggs) in a large bowl; beat with a mixer at medium speed until smooth. Fold in blueberries. Spoon 1/4 cup batter into each of 24 muffin cups coated with cooking spray. Bake at 350 degrees for 15 minutes or until muffins spring back when touched lightly in center. Remove muffins from pans immediately; place on a wire rack.