Place rinsed and dried mushrooms caps into a large resealable plastic bag or container and immerse in teriyaki sauce. Allow mushrooms to marinate for at least 30 to 60 minutes. (See notes below).
Preheat the oven to 375 degrees and line an edged baking sheet with parchment paper.
Place mushrooms caps onto the prepared baking sheet, cap side down, and bake in the preheated oven for 15 minutes.
Notes
The longer the mushroom marinates, the more intense the flavor it will yield. If you are in a hurry, liberally brush mushrooms with the teriyaki sauce and continue to follow the instructions above.