01 -
Set your oven to 200°C and line a baking sheet with foil paper.
02 -
Use paper towels to squeeze out as much water as you can from the thawed spinach. Place it in a bowl when done.
03 -
Combine the spinach with cream cheese, 1/2 cup parmesan, mozzarella, garlic, salt, and pepper. Mix it well.
04 -
Lay the mushrooms on the sheet and lightly spray both sides with olive oil.
05 -
Add the cheesy spinach filling to every mushroom cap.
06 -
Stir together panko breadcrumbs, the rest of the parmesan, and olive oil. Sprinkle it over the filled mushrooms.
07 -
Cook the mushrooms for 20-24 minutes until they're tender and the topping is golden brown.