Prepare outdoor grill for indirect grilling over medium-high heat. In large bowl, gently mix beef, cheese, and seasoning until just combined; do not overmix. Spray both sides of mushrooms with cooking spray; fill with beef mixture.
Place mushrooms, beef side up, on hot grill rack over unlit side of grill; cover and cook 30 minutes. Transfer mushrooms to lit side of grill; cover and cook 5 minutes or until internal temperature of filling reaches 160°. Serve mushrooms topped with tomato, onion, and lettuce along with pickle chips, ketchup, mayonnaise, and mustard.
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Directions
Prepare outdoor grill for indirect grilling over medium-high heat. In large bowl, gently mix beef, cheese, and seasoning until just combined; do not overmix. Spray both sides of mushrooms with cooking spray; fill with beef mixture.
Place mushrooms, beef side up, on hot grill rack over unlit side of grill; cover and cook 30 minutes. Transfer mushrooms to lit side of grill; cover and cook 5 minutes or until internal temperature of filling reaches 160°. Serve mushrooms topped with tomato, onion, and lettuce along with pickle chips, ketchup, mayonnaise, and mustard.