INGREDIENTS
1 lb
button mushrooms
3 tbsp
olive oil
3/4 tsp
kosher salt
1/2 tsp
pepper
2 small stalks
celery
1 small
shallot
1/4 cup
parsley leaves
1/2 cup
whole-milk low-moisture mozzarella cheese
1/4 cup
parmesan cheese
1/4 tsp
garlic powder
1/4 cup
vegetable broth
1 cup
panko breadcrumbs
1 large
egg
1