Pull out the mushroom stems and place them on a baking sheet.
Place the mushrooms caps on the baking sheet so that they would be stem side up.
In a small dish combine your whipped cream cheese spread with the garlic powder, onion powder, salt, pepper (to your taste) and parsley (to your liking.)
Mix well.
Spread over the mushrooms.
Top each mushroom with 1 slice of Weight Watchers American cheese singles.
Sprinkle 1tbs shredded cheddar over top of the cheese slice.
Bake for 7-10min or until mushroom is soft and cheese is warm and melted.