Gluten Free Buckwheat Texas Sheet Cake

Prep Time 20 mins Cook Time 20 mins Total Time 40 mins
Yields 12-24

A delicious, gluten free cake made with 100% buckwheat flour. My adaptation of a Gluten Free Texas Sheet Cake recipe on Gluten Free on a Shoestring.



    • 2 cups buckwheat flour
    • 1 tsp xanthan or guar gum
    • 7 Tbs cocoa
    • 2 c sucanat, or 2 scant cups regular sugar
    • 1 tsp baking soda
    • 1/4 tsp sea salt
    • 1 stick butter
    • 1 c coffee
    • 1 c sour cream
    • 2 eggs, separated into yolks and whites
    • 1 tsp pure vanilla extract
    • 1 stick butter
    • 1 pound powdered sugar
    • 7 Tbs cocoa
    • 1/4 tsp sea salt
    • 6 Tbs milk
    • 1 tsp pure vanilla extract


    1. Preheat your oven to 325 (300 if using a convection oven) and prepare a 9 x 13" baking pan by greasing, lining with parchment paper OR if using a well-seasoned stoneware bar pan, place in the oven while preheating
    2. In a large bowl, whisk together the first 6 ingredients
    3. In a small sauce pan, melt together the butter and coffee (don't boil, just melt)
    4. Pour the buttery coffee mixture into the dry ingredients and mix well to thoroughly combine
    5. Add egg yolks, sour cream and vanilla and mix well
    6. In a separate mixing bowl, beat egg whites until they are stiff
    7. Gently fold egg whites into batter
    8. Pour and spread cake batter into prepared baking sheet
    9. Bake until cake passes the toothpick test, 20-30 minutes
    10. Meanwhile, make frosting:
    11. Whisk together dry ingredients
    12. In the same small sauce pan, melt butter and milk together and bring to just a boil
    13. Pour into dry ingredients and whisk until smooth
    14. Add vanilla and combine well
    15. Pour immediately over hot cake and spread evenly


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