Baked Garlicky Chicken with Brown Sugar Glaze

8 thighs, 6 legs, seasoned1 (16-oz.) container Fajita chopped veggies (you can usually find this in larger grocery stores where they prep all the veggies for stir-fry and fajitas, if not just chop your own)1 (8-oz.) sliced portabella mushrooms1 c…