Blueberry Crisp

1 cup blueberries (I use 1 1/2 cups)
1 cup sugar
1 cup sour cream
2tbs flour
...
topping
1/2 cup butter
1 cup flour ( use whole wheat)
1 cup oats
1/2 cup brown sugar
Sometimes I add cinnamon

Place berries in baking dish (pie pan or square pan). Mix sour cream, sugar, and flour until smooth. Pour over berries. Mix topping till crumbly, sprinkle over berry mixture. Bake at 300 for 1 hour. I'm usually too impatient so I cook it at 350 for 15-20.