Cake Ingredients – 2 cups 1.1 gluten-free flour or all-purpose flour – 4 tsp baking powder – ½ tsp baking soda – ½ tsp kosher salt – 2 eggs – ⅔ cup sugar – 1 ½ cups sour cream – 1 cup room temperature butter – 3 tsp vanilla extract – ½ tsp ground cinnamon Cream Cheese Layer – 8 oz cream cheese room temperature – 1 tsp vanilla extract – 1 ½ cups powdered sugar Streusel Ingredients – 1 ¼ cups chopped walnuts – 1 ½ tsp ground cinnamon – ½ cup brown sugar – 8 tbsp room temperature butter – 1 cup 1:1 gluten-free flour or all-purpose flour – 1 Joyfully Grown Granny Smith apple peeled and finely diced – 1 Joyfully Grown Honeycrisp apple peeled and finely diced Glaze Ingredients – 1 ½ cups powdered sugar – 2 tsp milk