This recipe goes with Teriyaki Portabella Steaks with Noodle Slaw, Warm Lentil Salad with Portabellas
Set mushroom caps, gill side up, in a single layer in a lightly oiled 10- by 15- inch pan. Bake in a 400° oven until caps are flexible enough to bend easily, about 12 minutes (about 9 minutes in a convection oven).
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Oven-roasted Portabellas recipe