blueberry raspberry muffins

these are so yummy, i got them from my mother in law joann. she made them for me when i came home from the hospital after having avenue.

2 cups brown sugar
¾ cup butter
6 egg whites
2 cup vanilla yogurt
2 ¼ flour
2 tsp baking powder
1 tsp baking soda
1 tsp salt
2 cup oats

fluff egg whites, set aside. Melt brown sugar and butter. Let cool and add yogurt. Mix flour, bk powder, bk soda, salt, and oats. Combine all ingredients and fill muffin tins half way. Put berries in. fill tin then add more berries and sprinkle raw sugar on tops. Bake 375 for 18-25 min. freeze for storage.