Gluten-Free Crumb Cake

Preheat oven to 350 degrees F. Coat an 8-inch-square baking dish with cooking spray.

To prepare cake: Combine 1 cup almond flour, 1 cup gluten-free all-purpose flour, baking powder, salt and 1/2 teaspoon cinnamon in a large bowl. Combine eggs, yogurt, granulated sugar, melted butter and vanilla in a medium bowl. Add the wet ingredients to the dry ingredients and stir to combine. Toss apple with 1 tablespoon gluten-free all-purpose flour in a small bowl to coat. Fold the apple into the batter. Scrape the batter into the prepared pan.

To prepare crumb topping: Combine almond flour, gluten-free all-purpose flour, brown sugar, butter and cinnamon in a small bowl, mixing with a fork or your fingers until crumbly. Sprinkle evenly on top of the batter.

Bake the cake until the top is golden brown and a toothpick inserted in the center comes out clean, 30 to 45 minutes.