Step 1

Preheat grill to 350º (or medium heat)

Step 2

Place chicken breasts in a zipper freezer bag with Italian dressing and refrigerate for at least 30 minutes (up to overnight).

Step 3

Slice onion in half and then into slivers. Clean and slice mushrooms. Toss onions and mushrooms in olive oil and add to grill pan.

Step 4

Place chicken breasts on grill as well as grill pan with onions and mushrooms.

Step 5

After 5-8 minutes, turn chicken breasts and stir mushrooms and onions and cook 5-8 min more.

Step 6

After 10 min cook time, check chicken with meat thermometer at thickest portion of the breast and be sure chicken is 155º-160º. If chicken is not up to temp, continue to cook until it reaches temperature. It will finish cooking as it rests.)

Step 7

Move sauteed onions and mushrooms to one side of grill pan. Add chicken breasts into grill pan. Top with onions and mushrooms. Then top with grated cheese.

Step 8

Turn the heat down on the grill to 300º or low and shut lid to melt cheese for 2-3 minutes.

Step 9

Once cheese is melted, remove grill pan and let chicken rest for 3-5 minutes and serve.