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Preheat a well-oiled grill or grill pan to medium-high heat. Place 2 TBSP butter (4 TBSP for 4 servings) in a small bowl and bring to room temperature. Wash and dry all produce.
Halve ciabatta crosswise. Trim and halve zucchini lengthwise. Mince chives. Dice mozzarella into ½-inch pieces. Dice tomato into ½-inch pieces.
Pat steak* dry with paper towels; season all over with Brown Sugar Bourbon Seasoning, salt, and pepper. Set aside.
COOKING ALTERNATIVE: Adjust rack to top position and preheat oven to 425 degrees. Dice ciabatta into 1-inch pieces. Trim and dice zucchini into ½-inch pieces.