Preheat the oven to 375 degrees2. In a large bowl add mashed potatoes, maple syrup, and cinnamon.3. Mix all crumble toppings in a small bowl.Pour sweet potato mixture into a greased casserole dish. (I used a glass baking bread dish).4. Sprinkle the crumble topping over the sweet potato mixture.5. Bake for 25 to 30 mins.6. Enjoy! Store leftovers in an airtight container in the refrigerator. Reheat in the microwave or oven.