We love eating this French onion chicken over mashed potatoes (the sauce makes a nice gravy!) with a green veggie on the side. Feel free to serve yours with rice, risotto, or roasted sweet potatoes. As far as veggies go, green beans, steamed broccoli, or roasted brussels sprouts pair well. And don't forget some extra bread. Crescent rolls, biscuits, or something classic and crusty like sourdough or artisan bread would be great here!