In a small bowl, mix the dressing and sour cream; set aside.
Place chicken in a baking dish or oven-proof skillet big enough to hold all the chicken pieces. I used a 10-inch cast iron pan.
Spoon about 2 tbs of the dressing mixture on top of each chicken piece. Sprinkle the grated cheese evenly over all pieces. Then sprinkle the shredded cheese evenly over the pieces.
Bake for 20 minutes, or until chicken is 160℉ in the center of each pieces.
Set broiler to high and broil until the top is golden brown and bubbly.