Blueberry Coffee Cake - cooking recipe

Ingredients

1 box yellow cake mix (without pudding; reserve 3 heaping Tbsp.)
3 eggs
1/4 c. water
1 (8 oz.) carton sour cream
1 pt. fresh blueberries
2 Tbsp. butter
1/2 c. brown sugar
1 c. chopped nuts

Preparation

Combine first 4 ingredients, mixing well.
In a 9 x 13-inch baking dish, alternate layers of batter and blueberries until all is used. Cut butter into reserved cake mix and brown sugar.
Stir in chopped nuts.
Spread over batter and blueberries.
Bake at 350\u00b0 for 50 to 60 minutes.