How to cook fresh cheese stuffed portobellos?

thanks for the responses. This is the one item I have never cooked, grilled or baked and was completely lost as to how to go about it.

They are also delicious on the grill. Remove stems and scrape out the brown gills; brush both sides of mushrooms with olive oil, and place side to be stuffed face down on grill for 4-5 minutes. Remove and stuff. Place mushrooms back on grill, stuffing side up. Grill, covered, for about 5 more minutes.

Roast them in the oven at 375 till done, likely 30 minutes my best guess, but check earlier.