Optional: consider roasting the garlic (skin on) in dry skillet until slightly brown. When cooled peel and mince garlic.
Mix ~32 ounces of green enchilada sauce with sour cream.
Shred roasted chicken into a large bowl. Add garlic and diced chilies. OPTION: consider adding black beans.
Add sauce to chicken until moist (start with ~1 cup).
Heat tortillas briefly in microwave (cover with towel to avoid drying out). Put some sauce on a plate and moisten a tortilla, fill with a ~1/3 c chicken mixture, roll and place seam side down in 9x13 baking dish (NOTE: this quantity generally fills a 9x13 and a 8x8 dish).
Pour remaining sauce over enchiladas and sprinkle with shredded cheese. Cover with foil.
Bake at 350 deg in the middle of the oven until heated through (~40 minutes). Once bubbling, raise rack to top of oven and broil briefly to brown the cheese (~1-2 minutes).
Optional: consider garnishing with sliced scallions, sliced olives, diced avocado, salsa, sour cream
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