The balsamic glaze can be made anytime, I did it while I cooked my chicken. Add 1/2 cup balsamic vinegar to small sauce pan. Bring up to a boil then cut heat down to low, whisking occasionally for 12-15 mins until vinegar is reduced by half and thicker.
Marinade
Combine first four ingredients in a container you would like to use to marinade the chicken. Set aside.
Chicken Bruschetta
Put a rag on a cutting board, then a big piece of plastic wrap over that. Place chicken down, then another piece of plastic wrap on top. Make sure to leave plenty of space for the chicken to be flattened.
Take a mallet, rolling pin, or empty wine bottle and beat until very thin.
Place chicken in marinade container and put in the fridge for 30 minutes.
Once ready to cook, heat large saute pan on medium. Add chicken in two batches. Cooking 4 minutes on one side, and 1 minute on the other.
On the last batch of chicken add 1/2 diced tomato (not grape) to the pan. Cooking through and setting aside.
Add the remainder of the marinade and mushrooms to the pan. The mushrooms will soak up all the goodness left in the pan. Cook until soft about 7 minutes, stirring occasionally.
Plate on top of spinach that's been tossed in a light tasting vinaigrette. I used Lemon Dijon Vinaigrette, top with mushrooms, both tomatoes, balsamic glaze and fresh basil!