Almost Twinkie Cake

Ok I will admit it, this does not taste just like a twinkie -- but it is easy as can be with a doctored up cake mix and soooo good!!! Not sure where this came from, I have been making it for years! I generally use canola oil for the vegetable oil. The last five ingredients are for the topping.

• Ready In: 1 hr 20 mins
• Serves: 10-12
• Yields: 1 cake

Ingredients

• 1 (18 1/4ounce) package  white cake mix
• 1 (6ounce) package vanilla flavor instant pudding and pie filling mix
• 1⁄2 cup  vegetable oil
• 3  eggs
• 1  cup milk
• 1⁄2 teaspoon salt
• 1⁄2 cup margarine, softened
• 2  teaspoons vanilla extract, divided
• 4  tablespoons all-purpose flour
• 1  cup sugar
• 1⁄2 cup vegetable shortening
• 1  cup water

Directions

1. Combine cake mix and pudding in a large bowl, sift together with a fork.
2. Make a well in the middle and add oil, eggs, pudding, water, and half the vanilla to it.
3. Beat this mixture at medium speed for about 2 - 3 minutes.
4. Pour into a greased and floured 9x13" pan.
5. Bake at 350F for 40-45 minutes or until a cake tester inserted near the middle comes out clean. while the cake is cooling, make the filling.
6. FILLING.
7. In a saucepan mix the flour with the milk.
8. Cook this mixture until it thickens, stirring constantly; cool.
9. Add sugar, salt, shortening, margarine, and remaining vanilla.
10. Beat this mixture until it is fluffy and resembles the texture of twinkie filling. Spread this on the cooled cake.
11. Store the cake in your refrigerator.