Chop peppers, zucchini, and onion into 1 - 1 1/2 inch pieces
Marinate veggies and shrimp in olive oil, chopped garlic, salt and pepper for about 20 minutes
Place shrimp and veggies on skewers, alternating shrimp and vegetables
Grill for 3-4 minutes on each side
Brush kabobs with Miller's banana pepper mustard and grill for 1 minute more on each side
Serve with extra sauce for dipping!