Gluten Free Brown Sugar Sheet Cake

by - February 13, 2019

If you like sugar, like me, then this is the cake for you!  When sugar is right there in the title you know you are in for a treat.  I love brown sugar and try to use it as much as I can in my baking.  I think that it gives just a richer flavor to baked goods and you will be able to really taste it in this cake.  It is full of brown sugar and you will taste it, not only in the cake but the frosting as well.  It is rich a sweet and absolutely delicious. You will have a really hard time not going back for a second piece.  

Whenever I go to a person's house for dinner, I always bring a dessert of some sort.  It is really not fun when you go out to eat or go to a friend's house for dinner and you just have to sit and watch people enjoy dessert so I always offer to bring dessert with me so that I can enjoy it with everyone else and also be able to share gluten free baking with other people so that they know just how good it can be. This is a great cake to do that because it makes a lot and you will have lots to share with other people.  It is also easy to whip up and it will all be done is just about an hour.  So when you wait until the last minute to decided to make something, this is a really good option.
Sheet cakes are just so easy and delicious to make.  I love the brown sugar pan frosting.  It is AMAZING!! It really is pure perfection. It is sweet and rich and is the perfect compliment to the cake.  You will have a hard time to not lick the bowl when you make this frosting. It really is so good and the dark brown sugar just gives it the best flavor.
I just love this cake and it is such a great go to, to make for parties or anywhere you need to bring a dessert.  It is easy to make and everyone will just love it.  Check out the video down below to see exactly how I made this delicious sheet cake and make sure to head over to my YouTube channel for more great recipes and product reviews.
Yield: 18-24 servings

Gluten Free Brown Sugar Sheet Cake

A delicious and sweet cake that will serve lots of people and make everyone happy!
prep time: 40 minscook time: 20 minstotal time: 60 mins


  • 3 cups gluten free 1 to 1 flour blend (I use Bob's Red Mill 1 to 1 Gluten Free Flour Blend)
  • 1 1/2 teaspoons baking soda
  • 1 teaspoon salt
  • 1 3/4 cups brown sugar
  • 3/4 cup sugar
  • 1 1/2 cups unsalted butter at room temperature
  • 3 eggs, lightly beaten
  • 3/4 cup sour cream
  • 3 teaspoons pure vanilla extract
  • 3/4 cup unsalted butter
  • 1/2 cup whole milk, warmed
  • 1 1/2 cups dark brown sugar
  • 4 cups powdered sugar, sifted
  • 1/2 teaspoon salt
  • 1 teaspoon pure vanilla extract


  1. Preheat oven to 375 degrees F and line a baking sheet (jelly roll pan) with butter or parchment paper.
  2. In a medium bowl, whisk together gluten free flour blend, baking soda, and salt. Set aside.
  3. In a large bowl or mixer, cream butter and sugars (white and brown) together until fluffy and lightened in color. 2-3 minutes.
  4. Beat eggs and vanilla extract until incorporated, them mix in sour cream.
  5. Once combined, add in dry ingredients. 
  6. Pour batter into greased and/or lined baking sheet and place in oven.
  7. Bake for about 20-25 minutes, or until toothpick inserted in the center comes out clean. Remove from oven and let cool for 5 minutes.
  8. Prepare Icing: In a medium or large saucepan, whisk together butter, brown sugar and whole milk over medium-high heat. Bring mixture to a boil, then remove from heat.
  9. Stir in sifted powdered sugar, vanilla extract and salt, stirring until smooth and thickened. (Add more powdered sugar if desired)
  10. Pour over cake and let set.
  11. Slice and serve.
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