Ingredients:

  • 1.5 cups (190g) all-purpose flour
  • 0.75 cup (150g) granulated sugar
  • 1 tsp (5g) baking powder
  • 0.5 tsp (2g) baking soda
  • 1 tsp (2g) ground cinnamon
  • 0.25 tsp (1g) salt
  • 2 large (100g) eggs, room temperature
  • 0.5 cup (120ml) vegetable oil
  • 0.5 cup (120g) sour cream
  • 1 tsp (5ml) vanilla extract
  • 2 cups (300g) peeled and diced Granny Smith or Honeycrisp apples
  • 2 tbsp (25g) melted butter
  • 3 tbsp (35g) granulated sugar
  • 1 tsp (2g) ground cinnamon

Instructions:

  1. Preheat the oven to 350°F (175°C). Grease an 8-inch square pan and line it with parchment paper.
  2. In a large bowl, whisk together the flour, sugar, baking powder, baking soda, cinnamon, and salt until no lumps remain.
  3. Create a well in the center of the dry ingredients. Add the eggs, oil, sour cream, and vanilla. Whisk until the batter is smooth and pale, being careful not to overmix.
  4. Gently fold in the diced apples using a spatula until evenly distributed, then spread the mixture evenly into the prepared pan.
  5. Brush the melted butter over the top of the raw batter. Mix the topping sugar and cinnamon in a small bowl, sprinkle evenly across the surface, and press lightly with fingertips to set.
  6. Bake for 30-35 minutes until the edges pull away from the pan and a toothpick inserted into the center comes out clean or with a few moist crumbs.