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A slice of gluten-free texas sheet cake on a white plate

Gluten-Free Texas Sheet Cake

  • Author: Emily Dixon, Sweets & Thank You
  • Total Time: 50 minutes
  • Yield: 1 sheet cake (24-36 servings) 1x
  • Diet: Gluten Free


This is the gluten-free Texas chocolate sheet cake recipe you’ve been waiting for! All the classic chocolate flavor & delicious texture you love–just made gluten-free!



For The Gluten-Free Chocolate Sheet Cake:

  • 2 cups (240 grams) gluten-free measure for measure flour
  • 2 cups (400 grams) sugar
  • 1 tsp. baking soda
  • 1/2 tsp. salt
  • 1/2 cup sour cream or buttermilk (no homemade substitutes for the buttermilk)
  • 2 eggs
  • 1 tsp. vanilla extract
  • 1 cup (2 sticks, 8 oz.) butter
  • 1 cup water
  • 1/3 cup (30 grams) unsweetened cocoa powder (regular, NOT Dutch-processed)
  • OPTIONAL: 1 cup toasted pecans, roughly chopped

For The Chocolate Icing:

  • 1/2 cup (1 stick, 4 oz.) butter
  • 1/3 cup milk or cream
  • 1/3 cup unsweetened cocoa powder (regular NOT Dutch-processed)
  • 3 1/24 cups powdered sugar, sifted (measure first, then sift)
  • 1 tsp. vanilla extract


First, Make The Gluten-Free Texas Sheet Cake:

  1. Preheat The Oven & Prep Your Pans. Start by preheating the oven to 350 degrees and greasing a 13″ x 18″ x 1″ sheet pan with butter or spray oil (or line the pan neatly with parchment paper). 
  2. Whisk Dry Ingredients. In a large bowl, whisk gluten-free flour, sugar, baking soda, and salt until well combined. Set aside.
  3. Mix Eggs, Sour Cream & Vanilla. In a large liquid measuring cup or small bowl, combine eggs, sour cream and vanilla. (There will be a second where this looks like a big mess–just keep whisking and it’ll come together smoothly.) 
  4. Heat Butter, Cocoa Powder & Water. In a small saucepan, melt butter, cocoa powder, and water until almost simmering. You want it hot and smooth, so it can help thin out the batter. 
  5. Assemble The Cake Batter. Add sour cream mixture to the dry ingredients and mix to combine. (It’ll be thick and a bit dry.) Pour the cocoa mixture into the batter a bit at a time, mixing to incorporate the chocolate mixture before adding the next bit. Whisk until it’s smooth and even in texture.
  6. Pour Into Prepared Pan. Pour the sheet cake batter onto your prepared sheet cake pan. Gently smooth out the surface so it’s even and goes all the way to the edges of the pan. 
  7. Bake The Cake. Pop the cake pan into the oven and bake 18-20 minutes, or JUST until a toothpick inserted into the center of the cake comes out clean, with perhaps a few small moist crumbs. The cake is thin, so you don’t want to over-bake.)
  8. Make The Frosting & Top!

Immediately Start The Chocolate Fudge Frosting:

  1. Right after you remove the cake from the oven, begin the frosting. (Unlike most cakes, you want to pour the frosting on while the cake is still warm.)
  2. Melt Butter + Milk + Cocoa. In a small saucepan, melt butter, milk and cocoa powder together over medium heat, whisking regularly until it’s almost simmering/bubbling. (Don’t boil it, just heat it till it’s about to bubble.) 
  3. Mix In Powdered Sugar & Vanilla. Remove the frosting from the heat and stir in powdered sugar and vanilla, whisking until there are not clumps of powdered sugar. There may be a few small air bubbles–this is totally fine, you just don’t want powdered sugar lumps. If you want to mix the pecans INTO the frosting, do that now. 
  4. Pour Frosting Over Warm Cake. Pour the fudge frosting over the still-warm sheet cake and quickly use an offset spatula to gently spread the frosting evenly over the surface. Be gentle, since the cake is pretty moist! If you want to sprinkle the cake with pecans, do that now. 
  5. Cool At Least 20 Minutes. Let the sheet cake cool at least 20 minutes before slicing. I prefer to cool it about an hour to let the frosting set up, but some folks love when the frosting is still a bit soft and gooey.
  6. Slice & Serve! When you’re ready, slice the cake into 24-36 slices. (For 24 slices, cut the whole cake into quarters, then cut each quarter into 6 slices. For 36 slices, cut the whole cake into quarters, then cut each quarter into 9 slices.)
  7. Store Leftovers. If you have leftovers, cover the sheet pan with a lid, plastic wrap, or foil, and store at room temperature for 1-2 days, or the refrigerator for 2-3 days (my preference). 
  • Prep Time: 30 minutes
  • Cook Time: 20 minutes
  • Category: Dessert
  • Method: Oven
  • Cuisine: American

Keywords: gluten-free texas sheet cake, gluten free texas cake, gluten-free chocolate sheet cake, gluten free texas chocolate sheet cake

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