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Texas Sheet Cake

It's like cake but flat

oven 350°F
stovetop Medium
prep 5-10 min
bake / cook 30 min
total ~40-50 min
serves ~15 slices
posted July 3, 2026

Tools

  • 18x13" Sheet Pan
  • Medium Saucepan
  • 2x Mixing Bowls

Ingredients

Cake Batter
amount ingredient
1 Cup Water
1 Cup Butter
3 Tbsp Unsweetened Cocoa Powder This is the key ingredient, the better it is, the better the result
2 Cups All Purpose Flour
2 Cups Granulated Sugar
1 Tsp Baking Soda
1/2 Tsp Salt
1/2 Cup Sour Cream
2 Large Eggs
1 Tsp Vanilla Extract
Frosting
amount ingredient
6 Tbsp Milk
3 Tbsp Unsweetened Cocoa Powder
1/2 Cup Butter
3 + 3/4 Cups Powdered Sugar

Instructions

  1. 1

    Preheat oven to 350F, grease 18x13" pan

  2. 2

    Add water, butter, and cocoa powder to a medium saucepan over medium heat. Stir until combined, Bring mixture to a boil.

    • While this is heating up, continue to the next few steps
  3. 3

    Add sour cream, eggs, and vanilla into a bowl until thoroughly mixed.

  4. 4

    Mix in the flour, sugar, baking soda, and salt.

  5. 5

    Once the chocolate mixture is boiling, remove it from ehat and pour it into the mixture in the mixing bowl.

    • Mix this part really well - there shouldn't be any lumps remaining
    • Keep the saucepan around, clean if you have time. You'll need it for the frosting
  6. 6

    Pour mixture into the 18x13" pan. Even out with a spatula to avoid uneven cook.

  7. 7

    Put pan into oven between 14-18 minutes. Cake should be set, not jiggly or wet.

    • If it's not set at 18, keep it in the oven, check every minute
    • Start on the Icing roughly halfway through the bake.
  1. 8

    Add milk, cocoa, and butter to a saucepan over medium heat. Mix together, bring to a boil

  2. 9

    Once boiling, remove from heat and stir in powdered sugar.

    • If lumps persist, use a whisk. Icing should still be warm/hot by the time the cake is done baking
  1. 10

    Pour the hot icing over the cake. Evenly spread icing over cake with spatula. Wait 10-15 minutes so the frosting sets.