Prep Work: Chop bell peppers and drain tomatoes; store together. Mix marinade together: vinegar, olive oil, rosemary, salt and honey.
Preheat oven to 400 degrees. Chop bell peppers and mix in medium sized bowl with mushrooms, drained tomatoes, vinegar, olive oil, rosemary, salt and honey.
Place chicken in a lightly greased 13x9 baking pan, cover with vegetable mixture, cover with foil and place in oven.
Bake 50 min. Check to see that chicken is no longer pink. Let sit with loosened foil for 10 min. before cutting meat.
Make dressing while chicken bakes: (For yield of 6) Combine 1 Tbsp. balsamic vinegar, 3 Tbsp. broth from chicken and 1/4 tsp. salt. Slice chicken breasts thin on cutting board, top salad in bowl and drizzle dressing over top. Sprinkle with feta, parmesan, or any shredded cheese and pepper to taste.
Serve with buttered, whole grain bread.