Start by cleaning the mushrooms with a damp cloth to remove any dirt. Slice them evenly to ensure uniform cooking. Mince the garlic and set aside.
In a large skillet, heat the olive oil and butter over medium heat. Allow the butter to melt completely, creating a rich base for the mushrooms.
Once the butter has melted, add the minced garlic to the skillet. Sauté for about 30 seconds, just until it becomes fragrant. Be careful not to burn the garlic, as it can turn bitter.
Add the sliced mushrooms to the skillet. Stir them well to coat them in the garlic-infused oil and butter. Spread them out in an even layer for better sautéing.
Sprinkle salt and pepper over the mushrooms. Continue cooking for about 5-7 minutes, stirring occasionally, until the mushrooms are tender and lightly browned.
Once the mushrooms are cooked through, remove the skillet from the heat and sprinkle the grated Parmesan over the top. Stir until the cheese is melted and evenly distributed.
Transfer the Sauteed Garlic and Parmesan Mushrooms to a serving dish. Garnish with freshly chopped parsley for a burst of color and freshness. Enjoy immediately while warm!