Preheat oven to 400° F.
Find a baking dish that will fit both mushroom caps. Add all ingredients except mushroom caps and stir to create marinade.
Add mushrooms and rub sauce onto them. Let sit for 15 minutes, stem side down.
Once 15 minutes is up, rub mushrooms again with sauce before placing dish in the oven.
Bake for 15 minutes. Remove and turn mushrooms over. If there is any sauce left in the pan, spoon it over the mushrooms. Continue baking another 5-15 minutes.
Remove mushrooms and let sit for 5 minutes before slicing and serving.