Grilled Summer Vegetable Pizza

Ingredients

• 3 plum tomatoes (sliced)
• 1/2 small sweet onion (sliced)
• 1/2 zucchini (sliced)
• 1 large portabella mushroom (sliced)
• 1 tablespoon vegetable oil (divided)
• 1/2 teaspoon Italian seasoning
• 1/2 teaspoon salt
• 1/2 teaspoon pepper
• 1 12-inch premade whole wheat pizza crust
• 1 clove garlic (minced)
• 1 4 oz. part-skim mozzarella ball, sliced