Heat large sauté pan with oil. Season chicken with salt and pepper, then cook in sauté pan over medium heat - about 7 minutes per side, until fully cooked through
Sprinkle chicken with cumin, garlic powder, and taco seasoning; remove to platter and allow to cool
Sauté garlic in chicken drippings for 30 seconds, then add corn and chilies. Stir well to combine. Add tomatoes and sauté 1 minute
Shred chicken breasts and add to sauté pan. Dust mixture with flour
Microwave tortillas on high for 30 seconds or put in oven at 250F for 5 minutes or so, until softer and more pliable
Preheat oven to 350F
Coat the bottom of two 13 x 9 inch pans with enchilada sauce
Dip each tortilla in enchilada sauce, then spoon about 1/4 cup of the chicken mixture into each. Optional: put in a bit less filling and add some cheese inside the enchiladas
Fold over filling, place seam side down, about 8-10 per dish should fit
Top with remaining enchilada sauce and at least 1.5 cups of cheese
Bake for 15 minutes, until cheese melts
Serve with optional toppings such as avocado and sour cream