1 (8 ounce) package cream cheese, softened
1 cup mayonnaise
1 tablespoon sour cream
1 1/2 teaspoons Worcestershire sauce
1 teaspoon salt
1 teaspoon pepper seasoning
1/2 teaspoon dried minced onion
1 tablespoon vegetable oil
Place the cream cheese in a medium bowl. Mix in mayonnaise, sour cream, Worcestershire sauce, salt, pepper seasoning, onion powder and oil. Cover, and refrigerate for at least 2 hours.
Preheat an outdoor grill for high heat, and lightly oil grate.
Lightly oil grate. Place sandwiches on prepared grill. Brush them with grease, and brown quickly on both sides. Remove from grill, and brush with egg yolk mixture.
Cook sandwiches 2 to 3 minutes on each side, or on each side as needed.