Preheat oven broiler to 550 F. In a small bowl combine garlic, olive oil and salt. Set aside. Slice baguette on bias into 1/2 inch thick slices. Brush baguette slices with garlic-oil and place on cookie sheet. Toast in broiler about 1-2 minutes on each side until golden brown. Remove from broiler. Bread should be crisp on the outside, but still soft in the center. On each slice of bread place about 1 tablespoon chicken breast and 3 grape halves, then top with 2 tablespoons grated cheese. Place cookie sheet about 8 inches away from broiler and broil for 2-3 minutes until cheese is melted and bubbly. Place on serving platter and sprinkle with snipped chives and pepper.