In a large bowl, add leftover turkey, onion, peppers, cilantro, cumin & half of the cheese. Toss to combine.
In a large casserole dish, pour half of the enchilada sauce & spread across bottom of the dish. Spoon turkey mixture into the center of tortilla. Roll it up & place seam-side down in the baking dish. Repeat for all tortillas.
Top with remaining enchilada sauce & cheese. Bake 15-20 minutes uncovered or until sauce is bubbling & cheese is melted.