Moist Apple Streusel Cake Must Try

Instructions:

1. Preheat the oven to 350°F (180°C). Grease a 9-inch springform pan and line the bottom with parchment paper.
2. In a small bowl, combine 1 cup (125g) all-purpose flour, 3/4 cup (150g) light brown sugar, 1 tbsp (8g) ground cinnamon, and 1/4 tsp (1.5g) salt.
3. Using a fork or fingertips, rub 1/2 cup (65g) cold cubed butter into the streusel mixture until it resembles coarse wet sand with pea-sized lumps; place in the refrigerator to keep cold.
4. In a medium bowl, whisk together 2 cups (250g) all-purpose flour, 1 tsp (4g) baking powder, 1/2 tsp (3g) baking soda, 1/2 tsp (3g) salt, and 1 tbsp (8g) ground cinnamon.
5. In a large bowl, cream 1/2 cup (115g) softened butter and 1 cup (200g) granulated sugar until light and fluffy, about 3 minutes.
6. Beat in 2 large eggs one at a time, then stir in 1 tsp (5ml) vanilla extract.
7. Alternately add the dry cake ingredients and 1/2 cup (120g) sour cream to the butter mixture, starting and ending with the flour; mix on low speed just until combined.
8. Gently fold in 2 cups (300g) diced apples using a spatula until evenly distributed.
9. Spread the batter evenly into the prepared pan.
10. Generously sprinkle the chilled streusel over the top, pressing down very lightly.
11. Bake for 40–50 minutes until a toothpick inserted into the center comes out clean or with a few moist crumbs.
12. Allow the cake to cool in the pan for 15 minutes before releasing the sides of the springform pan.