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Instructions
Preheat an outdoor grill for medium heat and lightly oil the grate.
Slice zucchini into thick rounds. Combine butter and garlic in a small bowl.
Grill zucchini slices on the preheated grill for 3 minutes; flip, brush with butter mixture, and grill 3 minutes more. Flip again, brush with butter mixture, and grill until crisp-tender.
Spread sauce on zucchini and sprinkle with cheese; continue grilling until cheese begins to melt.