Watergate Cake - cooking recipe

Ingredients

1 pkg. white cake mix
1 pkg. Royal pistachio instant pudding (3 1/2 or 3 3/4 oz. size)
1 c. cooking oil
3 eggs
1 c. 7-Up
1/2 c. chopped walnuts

Preparation

Mix well and put in 9 x 13-inch pan.
Bake at 350\u00b0 for 40 to 45 minutes.