chicken thighs, bone-in, skin-on • olive oil, divided • Italian seasoning, divided • garlic powder, divided • McCormick Grill Mates Montreal Steak Seasoning, divided • McCormick Grill Mates Montreal Chicken Seasoning, divided • fresh lemon juice, divided • Dijon mustard, divided • brussels sprouts, trimmed • small potatoes, halved • red onion sliced into 8=10 wedges, not rings • garlic, sliced, optional •