Step 1

Heat oven to 350ºF.

Step 2

Remove stems from mushrooms; set aside. Use melon baller to carefully scoop small amount of flesh from each mushroom cap. Finely chop removed mushroom flesh and stems. Place caps, hollowed sides up, on parchment-covered rimmed baking sheet.

Step 3

Melt margarine in large skillet on medium heat. Add onions and chopped mushrooms; cook and stir 5 min. or until tender. Remove from heat. Stir in next 2 ingredients, and half each of the cracker crumbs and parsley. Use melon baller to portion filling into caps; top with remaining crumbs.

Step 4

Bake 25 min. or until heated through. Sprinkle with remaining parsley.