Apple Crisp Cake | The Fancy Pants Kitchen

Ingredients

• 2 & 1/2 cups (332g) all-purpose flour
• 1 & 1/2 tsp baking soda
• 1/2 tsp baking powder
• 1/2 tsp salt
• 2 tsp ground cinnamon
• 1 tsp ground nutmeg
• 1/2 tsp allspice
• 1 cup unsalted butter, room temperature
• 3/4 cup packed brown sugar
• 1 & 1/4 cups granulated sugar
• 1 tsp pure vanilla extract
• 1 large egg, room temperature
• 2 & 1/2 cups (600ml) unsweetened applesauce
• 2 large granny smith apples, peeled and diced into 1/4-inch cubes (about 340g)
• 2 tsp lemon juice
• 1/4 cup packed brown sugar
• 1/4 cup granulated white sugar
• 2 tbsp cornstarch
• 1/2 tsp ground cinnamon
• 1/4 tsp ground nutmeg
• 1/8 tsp salt
• 1 cup water
• 1/2 cup old-fashioned oats
• 1/2 cup all-purpose flour
• 1 & 1/2 tbsp granulated sugar
• 1/4 cup unsalted butter, softened
• 1 & 1/2 cups unsalted butter, room temperature
• 5 & 1/4 cups powdered sugar
• 1 & 1/2 tsp ground cinnamon
• 1 tbsp pure vanilla extract