Linda Beck's Texas Sheet Cake

Linda brings this to every faculty event we have at our school! The key to this moist cake is the frosting! Thanks for sharing this recipe Linda!

Mix together in a bowl:
2 C. flour
2 C. sugar
1 tsp. baking soda
3 eggs
1 T vinegar plus enough milk added to vinegar to make 1/2 cup

In a sauce pan bring the following ingredients to a boil while stirring over medium heat:
2 sticks margarine
4 T. cocoa
1 C. water

Add sauce pan mixture to bowl mixture. You can add 1-2 T. flour if needed.
Spray jelly roll pan with Pam oil and spead cake over pan. Bake at 400 degrees for 15 minutes.
Frost while cake is still warm.

Frosting:
1 1/2 sicks margarine
3 T cocoa
1 bag powdered sugar
2 T. milk
1 1/2 tsp. vanilla
Stir together over medium heat until it comes to a boil. Let boil for 30 seconds. Remove from heat and add 1 bag of powdered sugar (add gradually...if you put too much in, the frosting will separate and look "greasy"), milk, vanilla. Mix until smooth. Pour over entire cake.