Blueberry Diet Soda Cake - cooking recipe

Ingredients

16 ounces frozen blueberries or 16 ounces frozen mixed berries
18 ounces butter recipe cake mix
12 ounces diet 7-Up (Wild berry Plus)
1/2 cup walnuts, chopped (optional)

Preparation

Preheat oven to 350\u00b0.
Lightly spray 9x12 pan with butter cooking spray(regular is fine).
In true \"dump cake \" fashion, layer ingredients as follows:
1st--Berries.
2nd--cake mix.
3rd--nuts, (if using).
last--Diet mixed Berry 7up Plus.
DO NOT MIX!
Bake for about 35 minutes, or until top is golden brown.
Serve hot or cold.