Easy Grilled Veggies

Ingredients

• 1 large green bell pepper, cut into 2-inch pieces
• 1 large red bell pepper, cut into 2-inch pieces
• 1 large red onion, quartered
• 6 shallots, halved
• 2 tablespoons olive oil
• 1 teaspoon salt
• 1 teaspoon coarsely ground pepper
• Vegetable cooking spray
• 2 pints grape or cherry tomatoes