Doctoring pre-cooked food items

After taking up too much space talking about food on a column about doctors, I decided to start one about food that was influenced by several physician's assistants.

As I mentioned on Joe's thread, I was told there would be a good chance I might not feel well tomorrow.  I decided that, rather than consider cancelling Thurday Dinner, I would stop on the way home from getting "infused" with a stop by my favorite supermarkets Cafe-on-the-Run.  As I said on that thread, I got some Roasted chicken breasts(with bones and wings still on), kale salad, glazed carrots, and from their salad bar, a pint of loose sliced mushrooms.  My plan is to saute the mushroooms to make a sauce for the chicken (and I have a package of frozen pre-cooked quinoa - a vegetable that looks and tastes like a grain, so I figure I will put the chicken over the quinoa and add the sauce over.)

On hand I have fresh garlic, diced red onion, white wine, chicken stock, and cream.

Any quick ideas for a masterful sauce to make from those items more or less, to turn that pre-cooked chicken into?

Also have apple slices and cheddar on hand for appetizer.

Annie

Instant Coronation Chicken:

http://www.bbcgoodfood.com/recipes/6080/instant-coronation-chicken

Yum!