Preheat your oven to 350°F (175°C) and prepare a baking dish by greasing it lightly with olive oil. Clean the mushrooms thoroughly, chop them into smaller pieces, and set aside.

In a skillet, heat 2 tablespoons of olive oil over medium heat. Add minced garlic and sauté for 1 minute until fragrant. Then, add the chopped mushrooms and cook for 5 to 7 minutes until softened.

In a mixing bowl, combine the sautéed mushrooms, cream cheese, and cheddar cheese. Season with salt and pepper, then stir until well blended.

Spread the mushroom filling into the greased baking dish completely. Sprinkle breadcrumbs over the top and add more cheese for a cheesy crust.

Place in the oven and bake for 30 minutes or until golden brown and bubbling. Keep an eye towards the end to avoid over-baking.

Once baked, let the casserole cool for about 5 minutes before serving. Scoop into portions and enjoy with family and friends.