Pour olive oil in a skillet. Add chicken, cover
and cook over medium-low heat for 10 minutes.
While chicken cooks, cut squash and onions into cubes
and place in a bowl. Mince thyme and sprinkle over
squash and onion along with pepper. Set aside.
Remove cover from chicken, turn heat up to medium and
continue cooking until one side is golden brown. Turn
chicken and continue cooking to brown second side.
Remove chicken from skillet and set aside. In same
skillet, cook squash and onion over medium heat until
tender.
Transfer to a baking dish. Arrange chicken on top
of squash. Shred cheese over the top.
Place in oven and turn heat on to 400 degrees.
Bake until cheese is melted.