Gluten Free Texas Sheet Cake

I love Texas sheet cake and have been making it gluten free for years.  If you're craving some moist sweet chocolaty goodness covered in a fudge-like icing, this will fit the bill! 

Gluten Free Texas Sheet Cake 

2 cups gluten free flour mix

1 teaspoon xanthum gum

2 cups white sugar

1 teaspoon baking soda

1/2 teaspoon salt

1/2 cup buttermilk (or sour milk)

2 eggs

1 cup butter

1 cup water

5 Tablespoons cocoa

Fudge Icing:

5 tablespoons cocoa

6 tablespoons milk

1/2 cup butter

4 cups powdered sugar

1 teaspoon vanilla

Sheet Cake:  Preheat oven to 350 degrees F and spray  a 10x15 inch pan with cooking spray (please DON'T use the kind that has flour in it!) Combine the butter, water and 5 Tablespoons cocoa in a saucepan on medium heat. Bring mixture to a boil then remove from heat.  In a mixing bowl combine the flour, xanthum gum, sugar, baking soda and salt. On medium speed mix in the buttermilk and eggs after 1 minute add the cocoa mixture and mix until well combined. 

Pour batter into prepared pan and bake in the preheated oven for 20-25 minutes, or until a toothpick inserted into the center comes out clean. As soon as the cake is out of the oven, begin making the icing.

Fudge Icing: In a large saucepan, combine the milk, 5 tablespoons cocoa and 1/2 cup butter. Bring to a boil, then remove from heat. Stir in the powdered sugar and vanilla mixing until blended. Spread icing over warm cake.