Sour Cream Blueberry Coffee Cake

Terry says this is very yummy.

2 cups flour
3/4 cup sugar
1 tsp baking powder
1/2 tsp salt
1/4 tsp baking soda
1 egg
1 cup sour cream
1/4 cup applesauce
3 tbsp canola oil
1 tsp vanilla extract
1.5 cup blueberries

Topping:
1/4 cup packed brown sugar
1/4 cup quick cooking oats
1/2 tsp ground cinnamon
2 tbsp cold butter

In a large bowl, combine first 5 ingredients. In another bowl combine the next 5 ingredients. Stir wet ingredients into the dry ingredients until moistened. Fold in berries. Pour into 9 in square baking pan coated with nonstick spray.

For topping, combine first 3 ingredients . Cut in butter until mixture resembles course crumbs. Sprinkle over the batter. Bake at 350 for 45 minutes. Cool on a wire rack.