Place one fish fillet in center of each sheet of heavy duty aluminum foil. Season with salt and pepper, if desired. Top each fillet with 1 tablespoon Savory Herb Butter. Bring up foil sides; double fold top and ends to tightly seal packet.
Grill over medium-high heat 10 to 12 minutes or until fish flakes easily with a fork, turning once.
Combine 1/2 cup (1 stick) softened butter with 1 teaspoon each McCormick Italian Seasoning, Garlic Powder and Ground Mustard; mix until well blended.