Preheat grill or broiler. With small brush clean mushrooms; set aside. In small bowl combine oil and vinegar; set aside.

On 4 large or 8 smaller skewers alternately thread mushrooms, ham or bacon, pepper and basil leaves. Brush generously with oil-vinegar mixture; sprinkle with salt and pepper.

Grill or broil 4 to 5 inches from heat source until mushrooms are golden, turning occasionally , about 6 to 7 minutes. Place skewers on platter, brush with any remaining oil-vinegar mixture. Sprinkle with parsley.