Ingredients

• cooking spray
• 3 cups unbleached all-purpose flour
• 1/2 cup unsweetened cocoa powder
• 2 1/2 teaspoons xanthan gum
• 2 teaspoons baking soda
• 1 teaspoon kosher salt
• 2 cups water
• 2 cups demerara sugar
• 3/4 cup vegetable oil
• 2 tablespoons white vinegar
• 2 teaspoons vanilla extract

Instructions

1. Preheat oven to 350 degrees F (175 degrees C). Spray a 9x13-inch baking dish with cooking spray.
2. Whisk flour, cocoa powder, xanthan gum, baking soda, and salt together in a bowl. Add water, sugar, vegetable oil, vinegar, and vanilla extract to dry ingredients; mix until batter is just moistened and pour into the prepared baking dish.
3. Bake in the preheated oven until a toothpick inserted in the center of the cake comes out clean, about 40 minutes.