Placing mushroom upside down, fill the cap of each mushroom with 2 tablespoons of pasta sauce, or enough to cover (amounts vary depending on mushroom size).
Sprinkle 1 teaspoon of pine nuts over the pasta sauce and then top with parmesan.
Place mushrooms on a rimmed baking sheet and roast in the oven for 10-14 minutes depending on size, or until tender.
Remove from oven and serve immediately!
Notes
Tip: To enhance the deliciously meaty texture of these mushrooms, try making this great recipe on an outdoor grill!