Chocolate Cookie Sheet Cake

Chocolate cookie sheet cake

This chocolate cookie sheet cake is known by many names. (Texas chocolate cake comes to mind.) It has a texture similar to that of a brownie, and the buttermilk enhances the taste of  the chocolate.

Chocolate Cookie Sheet Cake

Prep Time: 15 minutes

Cook Time: 20 minutes


  • 2 c flour
  • 2 c sugar
  • 1/2 c butter
  • 1 c water
  • 1/2 c oil
  • 4 T cocoa
  • 1/2 c buttermilk * If you don’t have buttermilk, just use regular milk mixed with a teaspoon of white vinegar
  • 2 eggs
  • 1 tsp baking soda
  • 1 tsp vanilla
  • 1/2 c butter
  • 4 T cocoa
  • 1/3 c buttermilk (6 T)
  • 2 c icing sugar


  1. Mix flour and sugar.
  2. Melt butter, water, oil and cocoa in separate microsafe bowl (or pot) and bring to a rapid boil. Stir twice during heating.
  3. Pour over flour and sugar mixture and stir till smooth.
  4. Add buttermilk, eggs, baking soda and vanilla. Stir well.
  5. Pour onto a greased large cookiesheet.
  6. Bake at 375°F for 20 minutes.
  1. Bring butter, cocoa, buttermilk to a boil. Remove from heat. Add icing sugar slowly, blending carefully.
  2. Add vanilla.
  3. Pour over cake while icing is still hot.

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