• Preheat the oven to 350℉/176℃. Line a 9x9 baking pan with parchment paper and set aside.

For the streusel

• In a bowl, add the butter, flour, brown sugar, white sugar, and cinnamon. Using your hands or a fork, mix together until a crumbly streusel forms. Set in the fridge to chill.
  1 cup all-purpose flour, 1/3 cup white sugar, 1/3 cup brown sugar, 1 tsp cinnamon, 6 tbsp unsalted butter

For the cake

• In a bowl, add the flour, baking soda, baking powder, cinnamon, nutmeg, cloves, ginger, cornstarch, and salt. Stir to combine and set aside.
  1 3/4 cups all-purpose flour, 1 tbsp cornstarch, 3/4 tsp baking powder, 3/4 tsp baking soda, 1/4 tsp salt, 1 1/4 tsp cinnamon, 1/8 tsp nutmeg, pinch of cloves, pinch of ginger
• In a large bowl, add the brown sugar, white sugar, and eggs. Whisk for 1-2 minutes until well combined.
  1/2 cup white sugar, 1/3 cup brown sugar, 2 large eggs
• Add in the applesauce, oil, and vanilla. Continue whisking until smooth.
  1/2 cup oil, 1 cup unsweetened applesauce, 1 tbsp vanilla
• Add the dry ingredients. With a spatula, gently fold just until they are combined and no dry streaks are showing.
• Transfer the cake batter into the prepared pan and spread evenly. Sprinkle streusel on top.
• Bake the cake for 45-55 minutes or until a toothpick inserted in the middle comes out clean with no cake batter. Allow the cake to cool, slice, and enjoy!