HEAT oven to 400°F.
REMOVE stems from mushrooms. Finely chop enough stems to measure 1/4 cup. Discard remaining stems or refrigerate for another use.
MELT butter in small skillet on medium heat. Add chopped stems, onions and peppers; cook and stir 5 min. or until tender. Stir in cracker crumbs, cheese and seasoning; spoon into mushroom caps. Place on baking sheet.
BAKE 15 min. or until heated through.
serving size = 2 stuffed mushrooms (36 g)