Took this to the potluck and it was all the rage—recipe requests left and right!

1 lb four cheese tortellini (either fresh or frozen)
2 tablespoons olive oil
1 onion, chopped
2 cloves garlic, minced
1 lb mushrooms, sliced
1/4 cup all-purpose flour
2 cups milk
1 cup vegetable broth
1 cup shredded mozzarella cheese
1/2 cup grated Parmesan cheese
1/2 cup ricotta cheese
1/4 cup cream cheese, softened
1/2 teaspoon salt
1/4 teaspoon black pepper
1/2 cup breadcrumbs
2 tablespoons butter, melted
Fresh parsley, chopped (for garnish)