Preheat the oven to 425°F. Whisk the taco sauce with the peanut butter; stir in the chilies. Toss all but 1 cup of the sauce with the shredded chicken. Spoon chicken into tortillas and fold to enclose.
Arrange the rolled tortillas, seam side down, in a 9 x 13-inch casserole dish. Stir lime juice into the reserved sauce mixture. Pour the sauce down the center of the casserole dish; sprinkle with cheddar cheese. Bake for 20 minutes or until heated through.
Toss the queso fresco with the peanuts, cilantro and red onion. Scatter over the top of the casserole.