Gluten Free Dark Chocolate Sheet Cake | Wheat Free Mom

Ingredients

• 1/2 cup tapioca starch
• 1/2 cup brown rice flour
• 1/2 cup sorghum flour
• 1 cup dark chocolate gfree cocoa
• 1/2 tsp baking soda
• 2 1/2 tsp baking powder
• 1 1/2 tsp xanthan gum
• 3/4 cup room temperature butter
• 3/4 cup dark brown sugar
• 1 cup cane sugar
• 3 eggs
• 2 egg yolks
• 2 tsp gfree vanilla
• 1 1/2 cup buttermilk
• 1 cup dark chocolate chips (gluten-free)