Preheat your oven to 350°F and lightly coat a 9×13 baking dish with cooking spray—your battlefield is set!
Place the 8 chicken breast portions in a large pot and drown them in the 32 oz. can of green enchilada sauce. Bring to a boil over medium heat, then reduce to a simmer—cook for 15-20 minutes until the chicken shreds easily with a fork. Pull it apart and set aside, reserving the sauce.
Lightly coat a large skillet with cooking spray and heat over medium-high. Toss in the sliced green onions, 2 tbsp. chopped cilantro, and minced jalapeño (if you dare)—sauté for 2 minutes until fragrant.
Add the shredded chicken, diced green chilies, and a generous pour of the reserved enchilada sauce (about 1 cup) to the skillet. Stir occasionally, heating through for 5 minutes—your filling is forged!
In the baking dish, lay down a base of 4-5 corn tortillas (tear as needed to fit). Spoon over half the chicken mixture, sprinkle with a bit of the 1 cup shredded light cheddar, then repeat—tortillas, chicken, cheese—finishing with a final tortilla layer. Pour any remaining enchilada sauce over top and crown with the last of the cheese.
Slide into the oven and bake for 15 minutes, until the enchiladas are steaming hot and the cheese melts into a golden crown.
Divide the 2 cups shredded lettuce onto 4 plates. Slice the casserole into portions and place atop the lettuce beds. Top each with a spoonful of salsa, a dollop of light sour cream, diced tomatoes, and olives (skip ‘em for me—yuck!). Serve and savor the love!