Prepare outdoor grill for direct grilling over medium heat; line rimmed baking pan with nonstick foil and spray with cooking spray. In small bowl, whisk garlic, oil and seasoning blend. Makes about ¼ cup.
In large bowl, toss potatoes, onion, broccoli, carrots and 2 tablespoons garlic mixture; spread on prepared pan. Place pan on hot grill rack; cover and cook 20 minutes or until vegetables are tender-crisp, stirring once.
Push vegetable mixture to 1 side of pan; place salmon on opposite side. Brush salmon with remaining 2 tablespoons garlic mixture; cover and cook 12 minutes or until internal temperature of salmon reaches 145° and vegetables are tender. Makes about 5 cups vegetables.