Spray a 9x9 pan with avocado oil spray
Mix 2 cups Kodiak Buttermilk mix, 1 cup water, ½ cup fat-free Greek yogurt, ¼ cup maple syrup, 1 tsp vanilla, and 1 tsp cinnamon together
Pour batter into prepared pan
Mix crumble ingredients: ⅓ cup Kodiak mix, 2 tbsp brown sugar, 1 tbsp sugar, 2 tsp cinnamon, and 3 tbsp cold butter
Top batter evenly with crumble mixture
Bake at 350°F for 18-20 minutes
Let cool completely
Mix icing: ¼ cup powdered sugar and 2 tbsp Chocolate Fairlife shake
Drizzle icing over cooled cake
Top with Swerve powdered sugar if desired
Reheat in air fryer at 375°F for 3-4 minutes before serving for best results
