Preheat oven and bake onion rings according to package instructions. While they're baking, begin prepping the chicken portion, following the steps below.
Salt & pepper chicken and saute in olive oil until cooked through, usually 10-12 minutes on medium heat
Start a 2nd pan to sauté the onion & garlic in, after onion begins to transluce, usually about 5-7 minutes over medium heat, add the mushrooms and continue cooking until tender.
Push chicken and vegetable mixture towards the center of the pan, close together and lay 4-5 slices of provolone cheese over the top. Allow cheese to melt.
Top with an onion ring after plating the chicken & cheese combination.