01 -
Start by thawing your frozen spinach completely. This next step is absolutely critical - squeeze out every drop of water you can from the spinach using your hands, then wrap it in a clean kitchen towel and wring it out like you're doing laundry. Let it sit on the towel while you prep everything else, then give it one final squeeze. Trust me, soggy mushrooms are nobody's friend!
02 -
Heat your oven to 375°F. Give your mushrooms a gentle rinse and pat them completely dry with paper towels. Carefully twist off the stems - you can save these for another recipe or compost them. If you want extra room for filling, use a small spoon to scoop out a bit more of the mushroom cap.
03 -
In a medium mixing bowl, combine the softened cream cheese, sour cream, chopped green onions, garlic powder, Italian seasoning, mozzarella, and your super-dry spinach. Mix everything together until it's well combined and creamy.
04 -
Generously fill each mushroom cap with the spinach mixture - don't be shy, really pack it in there! Sprinkle the parmesan cheese over the tops for that golden, bubbly finish. Arrange them on a lightly greased baking sheet or casserole dish.
05 -
Slide your stuffed mushrooms into the oven and bake for 20-24 minutes, or until the tops are beautifully golden brown and the mushrooms are tender. Let them cool for just a minute or two before serving - they'll be piping hot!