Ingredients

• 1 cup all-purpose flour
• 0.75 teaspoons ground cinnamon
• 0.5 teaspoons baking soda
• 0.25 teaspoons salt
• 0.75 cups brown sugar
• 0.25 cups unsalted butter , softened
• 1 large egg
• 0.25 cups sour cream
• 0.25 cups vanilla yogurt
• 1 teaspoon vanilla extract
• 2 cups diced Granny Smith apple

Instructions

1. 1 Gather all ingredients. Preheat the oven to 350 degrees F (175 degrees C). Grease and generously flour an 8-inch square baking dish.
2. 2 To make the cake: Stir flour, cinnamon, baking soda, and salt together in a bowl.
3. 3 Beat brown sugar and butter with an electric mixer in a large bowl until light, fluffy, and noticeably lighter in color. Mix in egg, then mix in sour cream, yogurt, and vanilla until well incorporated.
4. 4 Gradually mix in flour mixture, then fold in apples. Pour batter into the prepared baking dish.
5. 5 To make the crumb topping: Mix brown sugar, flour, butter, and cinnamon together in a bowl with a fork until crumbly. Sprinkle over cake batter.
6. 6 Bake in the preheated oven until a toothpick inserted into the center comes out clean, 35 to 40 minutes. Remove from the oven and cool on a wire rack.
7. 7 Serve and enjoy!

Nutrition per serving