Preheat the oven to 375°F (190°C).
Prepare the mushrooms by cleaning and removing stems.
In a mixing bowl, combine cream cheese, mozzarella, Parmesan, chopped spinach, artichokes, minced garlic, lemon juice, salt, and pepper.
Fill each mushroom cap generously with the cheese mixture.
Place the filled mushrooms on a baking sheet and drizzle with olive oil.
Bake in the preheated oven for 20-25 minutes, or until the mushrooms are tender and the tops are golden.
Remove from the oven and let cool for a few minutes before serving.