Step 1 of 9
Gluten-Free Coffee Cake
Preheat the oven to 350°F.
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Step 2 of 9
Gluten-Free Coffee Cake
Spray a 9-inch square baking dish liberally with nonstick cooking spray. Set aside.
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Step 3 of 9
Gluten-Free Coffee Cake
Place the butter, sugar, and vanilla in a large mixing bowl. Use a mixer to cream ingredients together on medium-high speed until smooth, 1-2 minutes. Add the eggs, sour cream, and buttermilk, and continue beating until mixture is light and fluffy, about 1 minute.
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Step 4 of 9
Gluten-Free Coffee Cake
Sift the gluten-free flour, baking powder, baking soda, and salt into the bowl. Mix on low speed, scraping down sides of bowl with rubber spatula as needed, until a smooth, thick batter forms.
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Step 5 of 9
Gluten-Free Coffee Cake
Pour the batter into the prepared baking dish with a rubber spatula, and smooth into an even layer.
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Step 6 of 9
Gluten-Free Coffee Cake
Place the gluten-free flour, brown sugar, granulated sugar, cinnamon, and salt in a large mixing bowl. Stir with a fork to combine. Drizzle melted butter into the bowl and mix with a fork until the mixture forms large crumbs. Sprinkle crumble evenly over the top of the cake batter.
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Step 7 of 9
Gluten-Free Coffee Cake
Bake the coffee cake on middle rack of oven until topping is golden and toothpick inserted in center comes out clean, 35-45 minutes.
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Step 8 of 9
Gluten-Free Coffee Cake
Check to see that coffee cake is done. Remove from oven or add time as needed.
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Step 9 of 9
Gluten-Free Coffee Cake
Allow cake to cool in the pan for 15-20 minutes before serving. To store, cover tightly with aluminum foil or store in an airtight container and keep at room temperature for 1-2 days, refrigerate for up to 1 week, or freeze for up to 2-3 months.