Texas sheet cakes are alternately fluffy and moist, and a Texas-sized hit with everyone who tries one for the first time. Also called Texas brownie cake, or Texas sheath cake, this cake will please everyone from Houston to Hollywood.
For the cake, you will need 2 cups all-purpose flour, 2 cups white sugar, 1 teaspoon baking soda, 1/2 teaspoon salt, 1/2 cup sour cream, 2 eggs, 1 cup butter, 1 cup water, and 5 tablespoons unsweetened cocoa powder. For the frosting, you will need 6 tablespoons milk, 5 tablespoons unsweetened cocoa powder, 1/2 cup butter, 4 cups confectioner's sugar, 1 teaspoon vanilla extract and 1 cup chopped walnuts (or nuts of your choice).
To make the cake, first preheat your oven to 350 degrees Fahrenheit. Take a 10 x 15 inch pan, and grease it. When it is greased, sprinkle it liberally with flour. Next, get a medium sized bowl and toss in the 2 cups of white sugar, 1 teaspoon baking soda, ½ teaspoon salt and the 2 cups all-purpose flour. Mix thoroughly. Add in your ½ cup sour cream. Beat your 2 eggs, and add them to the mix as well. Mix all the ingredients thoroughly, and set aside your bowl. Next, take a saucepan and melt your 1 cup butter using low heat. When the butter is melted, pour in the 1-cup water and add the 5 tablespoons of unsweetened cocoa powder. Turn up the heat and allow your chocolate butter to boil. Once boiled, set the saucepan aside and allow the mixture to cool for a minute, and then add the mixture that you set aside earlier. Add your mixture to the 10 x 15 pan. Bake for 20 minutes.
Use the old toothpick test. Stick it into the cake at the 20-minute mark. If it comes out clean, it’s done. To make your frosting, get a large saucepan. Add in the 6 tablespoons milk, tablespoons cocoa powder and ½ cup butter. Heat until boiled. Take your saucepan off the burner and add your 1 teaspoon vanilla and the confectioners’ sugar. Add in your nuts and mix until they’re thoroughly dispersed in the mix. Dress your cake with the frosting and enjoy!