Step 1

Preheat oven to 350 degrees F. Grease a 9 inch pan with nonstick spray and set aside.

Step 2

Make the sauce: Add tomato sauce, water, chili powder, cumin, oregano, salt and cayenne pepper to a medium saucepan and place over medium heat. Bring to a low boil then reduce heat to low and simmer for 15 minutes or until tomato sauce thickens up a bit.

Step 3

Saute the onions and peppers: In a separate skillet, heat 1 teaspoon of olive oil over medium high heat. Once oil is hot, add in garlic, onion and red pepper. Saute for 5-7 minutes or until onions are translucent and peppers are tender. Remove from heat and set aside.

Step 4

To make the bake: In a separate medium bowl, add in polenta and a few tablespoons of water. Use your hands to mash the polenta and break it up again. Transfer to prepared pan and press into the bottom of the pan, creating a base for the bake.

Step 5

Next spread half of the refried beans, slices of the sweet potato, onion/pepper mixture, half of the sauce and 1/2 cup of cheese. Then spread the remaining refried beans on top, the rest of the sweet potatoes, the other half of the sauce and remaining 1/2 cup of cheese.

Step 6

Cover pan with foil and bake for 1 hour or until sweet potatoes are tender when poked with a fork. Serves 8.