Moist Gluten-Free Coffee Cake with Sour Cream

What's the problem with most gluten-free coffee cake recipes? They are disappointedly dry with a sandy crumb on top. This is the recipe you need! Making a gluten free crumb cake with sour cream tenderizes and softens the GF starches. Plus, the cinnamon streusel topping uses an egg yolk to bind it into thick, glorious clumps. Experience an old fashioned snack cake just as good as the homemade, vintage-style one you grew up on!

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% Daily Values based on a 2,000 calorie diet

Step 1

Adjust oven rack to UPPER MIDDLE POSITION and preheat oven to 325°F. Spray a 8X8 inch baking pan with cooking spray and set aside.

Step 2

In a large bowl or stand mixer, mix together flour, sugar, baking powder, baking soda, and salt on low speed to combine. Add butter, a tablespoon at a time, and mix until crumbs form with no large pieces of butter visible.

Step 3

Add sour cream, whole egg, egg yolk, and vanilla extract. Mix on medium speed until well combined and batter is light and fluffy.

Step 4

Spread cake batter evenly in prepared pan. (Don't clean the bowl yet! You'll use it for the crumb topping.) The mixture will be thick, so if you aren't able to spread it with a spoon, lightly wet your fingers and spread evenly in the pan.

Step 5

In a microwave-safe bowl, melt the butter. Add the melted butter to the cake batter bowl and whisk in the sugar, brown sugar, egg yolk, cinnamon, and salt. Beat the in flour until no flour pockets remain and it becomes a thick dough.

Step 6

Break crumb topping pieces off into pieces and sprinkle evenly over batter. Use a knife to slightly swirl the crumb topping down into the cake. Use your hand to gently press the crumb topping on top.

Step 7

Bake for 45-50 minutes, rotating pan halfway through. Use a toothpick inserted down into the cake to check if it comes out clean. Since the cake portion is far down, make sure you are testing the cake and not the crumb topping.

Step 8

Cool on wire rack and meanwhile prepare the glaze frosting. The glaze can be drizzled on while the cake is warm, but wait at least 30 minutes before slicing and serving.

Step 9

In a small bowl combine powdered sugar, milk, and vanilla extract. Mix well until smooth and no lumps remain. If glaze is too thick for pouring on, add a tiny dash of milk and check again.

Step 10

Drizzle glaze over the crumb topping and let stand for 30 minutes before slicing and serving.

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