3 Tbsp. olive oil, divided
1 red onion, cut into 1/4-in. dice
2 tsp. ground cumin
4 cloves fresh garlic, minced
5 canned whole green chilies, coarsely chopped
4 canned chipotle peppers, coarsely chopped
1 c. frozen corn kernels, thawed
1 28-oz. can Mexican-style stewed tomatoes, drained and coarsely chopped (reserve the liquid to combine with the enchilada sauce)
1 1/2 lbs. cooked chicken meat, shredded
8 large corn tortillas
1 1/2 c. prepared enchilada sauce
1/2 c. cheddar cheese, coarsely grated
1/2 c. Jack cheese, coarsely grated
garnish: chopped fresh cilantro, chopped scallions, finely diced tomatoes and sour cream