Haven't made this in years & don't know why because it's so good. Nice that you can make it with just one pan & the jellyroll pan.

TEXAS SHEET CAKE
Cake:
2 cups flour
2 cups sugar
Dash of salt
2 sticks margarine
1 cup water
5 TBL cocoa
1/2 cup buttermilk
2 eggs
1 tsp cinnamon
1 tsp baking soda
1 tsp vanilla

Coil margarine, water & cocoa. Pour over mixture of flour, sugar & salt & stir rapidly. Add buttermilk, eggs, cinnamon, baking soda & vanilla. Bake on a large, greased jellyroll pan in a preheated 400° oven for 20 minutes - no more! (Test with a toothpick after 15 minutes.) While cake bakes, during last 5 minutes, make the icing.~~

Icing:
6 TBL milk
1 stick margarine
1 box powdered sugar
1 tsp vanilla
4 TBL cocoa
1/2 cup chopped pecans

Melt margarine w/milk & cocoa & pour over powdered sugar. Add vanilla & nuts; mix well. Ice cake as soon as it comes out of the oven.~~