Mexi-Flavored Sweet Potato Casserole

1 large sweet potato, grated
1 medium onion (optional)
olive oil
frozen corn (1 cup or so)
1 can black beans
12 oz. diced tomatoes
cheese of desired flavor
tortillas
cumin, oregano, chili powder, cilantro to taste

Saute onion in olive oil. Add grated sweet potato.  Cook, covered, about 8 minutes, or until softened.  Add corn, beans, and tomatoes, along with seasonings to taste (1 tsp. of each, 1/4 tsp. chili powder is a mild mix). Simmer briefly.

Rip up tortillas- line bottom of greased square pan.  Add 1/2 sweet potato blend.  Top with cheese, more tortilla shreds.  Add rest of sweet potato blend, and top with cheese.  Bake @ 350 +/- 40 min, until cheese is melted and bubbly.