Preheat oven to 350°F. Line a baking sheet with parchment paper. Spread marinated mushrooms into a single layer on parchment-lined baking sheet. Roast in oven for about 10 minutes, or until dark and very lightly crisped at edges.
For an even stronger taste, cook until the shiitake mushrooms are really dark. And I'll be honest, I kind of like their flavor when they're almost burnt.
Use shiitake bacon in any way you would normally use real pork bacon.