Rinse, pat dry and remove stems from mushrooms (use in soup, etc), set caps aside. In a medium bowl mix cream cheese, ham, olives, mustard, onion powder, turmeric and black pepper. Spoon or pipe into mushroom caps.
Bake at 350 degrees for about 15 minutes. Garnish with sliced green onions or pimentos. Makes about a 18 large mushrooms or about 40 small mushrooms.