Party with portabellas! You'll love them because they can be made ahead; party goers will find them delicious.
SAVE ON THIS RECIPE!
Use a small ice-cream scoop or the large end of a melon ball cutter to scoop the vegetable mixture evenly into the mushroom caps.
Prepare mushrooms through step 3; store tightly covered in refrigerator up to 24 hours before baking and serving.
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