After moving a rack six inches, turn on the broiler and increase the heat.
Prepare the sauce: Put the pumpkin, tomatoes, chipotles, chicken stock, chili powder, garlic, salt, and pepper in a blender. Process till smooth.
Put Together: Heat the oil in a large ovenproof pan or black iron skillet over medium heat until shimmering. Add the onion and a pinch of salt; simmer for 3 to 5 minutes, turning periodically, or until the onion is transparent.
Add the chopped greens or roasted vegetables, and simmer, turning often, for 2 to 3 minutes, or until cooked through (for the greens).
Pour in all of the enchilada sauce, toss to ensure that everything is covered, then add the chopped tortillas and turkey.
Heat through for five minutes, stirring periodically, after bringing to a boil. Take off the heat and equally distribute the cheese on top.
Place the skillet on the rack next to the broiler, and broil for one to two minutes, or until the cheese is melted and beginning to color in places. Give it five minutes to cool.
Add fresh cilantro, sliced jalapeƱo, and sour cream over top.