Crockpot Ranch Mushrooms

2 packages whole button mushrooms, halved

1 stick butter, melted

1 package dry Ranch dressing mix

2 tablespoons Parmesan cheese

Place mushrooms in the slow cooker. Mix together melted butter and Ranch dressing mix. Pour over top of mushrooms. Top with Parmesan cheese and stir to combine. Cook on low 2-4 hours.