Can I prepare stuffed mushrooms ahead of time?
Yes. Stuff the mushrooms, cover, and refrigerate up to 4 hours before baking. Add 5 minutes to bake time if baking from cold.
Can I use frozen spinach instead of fresh?
Yes. Thaw frozen spinach and squeeze out excess moisture thoroughly to prevent a watery filling.
How do I know when the mushrooms are done?
Bake until the mushroom caps are tender when pierced with a fork and the cheese topping is golden brown, about 20–25 minutes at 375°F.
What size mushrooms should I use?
Use medium to large white button mushrooms (about 2–3 inches across) so they hold the filling without tipping over.
Can I make these vegetarian?
Yes, this recipe is already vegetarian. Ensure your cream cheese, mozzarella, and parmesan are from vegetarian-friendly sources if needed.