Garlic Parmesan Easy Stuffed Mushrooms

INGREDIENTS

1 lb

whole button mushrooms (I used brown ones)

1/4 cup

butter

small onion (finely chopped)

3 cloves

garlic (finely minced)

2/3 cup

breadcrumbs

1 tbsp

Italian seasoning (I used a herb mix without added salt)

4 tbsp

grated parmesan (or more to taste)

1 tbsp

chopped fresh parsley

Salt and black pepper (to taste)

Lemon juice (to serve (optional))