Here is a recipe using fresh strawberries...no oatbran.

Fresh Strawberry Muffins (source unknown)
2 1/2 C flour
2/3 C sugar
1 tsp. baking soda
3/4 tsp. cinnamon
1/2 tsp. salt
1 1/2 C sliced fresh strawberries
1 C nonfat buttermilk
1/3 C. margarine, melted
1 1/4 tsp. vanilla extract
1 egg, lightly beaten
1 egg white, lightly beaten
Vegetable cooking spray
1 1/2 TB sugar

Combine flour and next 4 ingredients in a large bowl, and stir well. Add fresh strawberries; stir well, and make a well in center of mixture.

Combine buttermilk and the next 4 ingredients; stir well. Add to dry ingredients, strirring just until moistened.

Divide batter evenly among 18 muffin cups coated with cooking spray; sprinkle 1 1/2 TBs sugar evenly over muffins. Bake at 350 degrees or until done. Remove from pans immediately; let cool on a wire rack.I think you could use frozen strawberries if you adjusted the amount of milk as moisture.