Blueberry Crunch - cooking recipe

Ingredients

2 1/2 sticks margarine (unsalted or Parkay) *
3 (10 oz.) cans crushed pineapple (do not drain)
3 large cans blueberries, drained
1 box Duncan Hines cake mix (butter recipe)
2 c. sugar
2 c. nuts

Preparation

*One stick for the bottom of casserole dish at the beginning of recipe and 1 1/2 sticks, melted for topping.