Make Ahead
Canapés can be baked up a day ahead. Cover in plastic wrap and refrigerate. Reheat in preheated oven at 375 F for 10 min. Sprinkle with fresh basil and serve.
To Double
Prepare second pastry sheet by doubling ingredients. Otherwise, separate frozen pastry sheets and store leftover sheet in freezer.
Creative Leftovers
Serve as a side dish, by stirring in 2 Tbsp. lemon juice to moisten mushrooms and to deglaze the pan. Add herbs like thyme and sage, if desired.