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Texas Sheet Cake

Course: Dessert
Keyword: cake, icing

Ingredients

Cake Ingredients

  • 1 box chocolate cake mix 15.25 oz
  • 1 cup water
  • ½ cup sour cream
  • ½ cup vegetable oil or melted butter
  • 3 large eggs
  • 1 tsp vanilla extract

Extra-Thick Texas Sheet Cake Glaze

  • ¾ cup unsalted butter 1 ½ sticks
  • cup unsweetened cocoa powder
  • ½ cup milk add more if needed
  • 2 tsp vanilla extract
  • 5 –5 ½ cups powdered sugar sifted

Instructions

Instructions - Mini Cakes

  • Preheat oven to 350°F (175°C).
  • Grease or line your mini loaf pans.
  • Fill each pan about ½ full (~½ cup batter each).
  • Bake for 18–22 minutes, or until a toothpick inserted in the center comes out clean.
  • Cool in the pan for about 10 minutes, then pour glaze over while still warm.

Instructions - Sheet Cake

  • Preheat oven to 350°F (175°C).
  • Grease and flour a 13x18-inch sheet pan (jelly roll pan).
  • Pour batter into the pan and spread evenly.
  • Bake for 20–22 minutes, or until a toothpick inserted in the center comes out clean.
  • While the cake is still warm, pour the glaze evenly over the top so it soaks in.

Glaze Instructions (Stove)

  • In saucepan, bring butter, cocoa, and milk to a gentle boil while whisking.
  • Remove from heat, stir in vanilla.
  • Beat in powdered sugar until glossy, pourable, and slightly thick (fudge-like).
  • Pour over mini loaves while warm. Let set 20–30 minutes before serving.

Glaze Instructions (Microwave)

  • In microwave safe bowl combine bring butter, cocoa, and milk. (Use a bowl bigger than you think you need)
  • Microwave on 50–70% power in 30–45 second increments, whisking after each.
  • Continue until butter is fully melted and mixture is smooth and just starting to bubble (usually ~2–3 minutes total).
  • Whisk in vanilla extract and powdered sugar, 1–2 cups at a time, until glossy and pourable.
  • Pour over warm cakes right away — it sets quickly as it cools.
  • ○ For a thicker, fudgier glaze → stick closer to 5 ½ cups powdered sugar.
  • ○ For a classic pourable sheet cake glaze → closer to 5 cups (and add a splash of milk if needed).