Preheat oven to 350° F and grease a 9x13 baking dish or two smaller dishes if you want to leave cheese off of one
Cook quinoa following directions on the bag and add a teaspoon of Better Than Bouillon vegetable or mushroom base to water if desired. Once quinoa is cooked and water is absorbed, remove from heat and fluff with a fork. Set aside.
In a large skillet, heat oil over medium-high heat and add onion and garlic. Cook until soft. Add in peppers and corn and cook for about 4 minutes. Add in the cumin, chili powder, lime juice, and cilantro. Stir well and add salt and pepper.
Add to the skillet the cooked quinoa, black beans, enchilada sauce, and 1/2 cup of the cheese (to make the dish vegan, you can skip the cheese or use vegan cheese) and combine well.
Pour the mixture into the prepared baking dish or dishes. Top with remaining cheese if desired. Cover casserole with foil.
Bake for 25 minutes and then remove the foil. Bake an additional 10-15 minutes until the cheese is melted.
Let sit for 10 minutes before serving.