Ingredients:

  • All-purpose flour: 1 cup (120g)
  • Packed light brown sugar: ½ cup (100g)
  • Granulated sugar: ¼ cup (50g)
  • Ground cinnamon: 1 teaspoon
  • Unsalted butter, cold and cubed: ½ cup (113g / 1 stick)
  • Pinch of salt
  • All-purpose flour: 2 cups (240g)
  • Baking powder: 2 teaspoons
  • Baking soda: ½ teaspoon
  • Ground cinnamon: ½ teaspoon
  • Ground nutmeg: ¼ teaspoon
  • Salt: ½ teaspoon
  • Unsalted butter, softened: ½ cup (113g / 1 stick)
  • Granulated sugar: 1 cup (200g)
  • Large eggs: 2
  • Vanilla extract: 1 teaspoon
  • Sour cream: ¾ cup (170g)
  • Milk: ¼ cup (60ml)
  • Apples, peeled, cored, and diced (Granny Smith, Honeycrisp, or a mix): 2 medium (about 2 cups diced)

Instructions:

  1. Prepare the Streusel: Combine dry ingredients (flour, sugars, cinnamon, salt) in a bowl. Cut in the cold butter until mixture resembles coarse crumbs. Set aside in the fridge.
  2. Prepare the Cake Batter: Whisk together dry ingredients (flour, baking powder, baking soda, spices, salt) in a medium bowl.
  3. Cream Butter and Sugar: In a large bowl, cream together the softened butter and sugar until light and fluffy.
  4. Add Eggs and Vanilla: Beat in the eggs one at a time, then stir in the vanilla extract.
  5. Alternate Dry and Wet Ingredients: Gradually add the dry ingredients to the wet ingredients, alternating with the sour cream and milk, beginning and ending with the dry ingredients. Mix until just combined.
  6. Fold in the Apples: Gently fold in the diced apples.
  7. Assemble and Bake: Pour the batter into the prepared pan. Sprinkle the streusel topping evenly over the batter.
  8. Bake: Bake in a preheated oven (350°F / 175°C) for 45-55 minutes, or until a wooden skewer inserted into the center comes out clean.
  9. Cool: Let the cake cool in the pan for 10-15 minutes before removing it to a wire rack to cool completely.