Preheat your oven to 425.
Prepare the vegetables by peeling and dicing the sweet potatoes, and dicing up the poblano peppers. Add frozen corn. Brush with olive oil and spread over a roasting pan.
Roast the vegetables for 20-25 minutes until the sweet potatoes are soft and the peppers are nicely charred. Set aside.
Lightly grease a 9x13 inch pan.
Spread about 1 cup of enchilada sauce along the bottom of the pan.
Layer 1/3 of the cut tortillas along the bottom.
Top with 1/3 of the mixed vegetables and beans.
Add 1/2 cup of cheese.
Repeat for 2 more layers.
Bake for 25 minutes at 375.
Serve hot and top with salsa, fresh cilantro, green onion, avocado, or sour cream.