italian cheese stuffed shells & easy meatballs

Ingredients

• 24 - uncooked jumbo pasta shells
• 1 cup chopped fresh mushrooms
• 1 cup finely chopped onion
• 1 teaspoon plus 1/4 cup butter, divided
• 1 1/2 cups ricotta cheese
• 1 package (8 ounces) cream cheese, softened, divided
• 1 1/2 cups shredded asiago cheese, divided
• 1 cup shredded parmesan cheese
• 2 tablespoons minced fresh parsley, divided
• 1/2 teaspoon garlic salt
• 1/4 teaspoon pepper
• 2 tablespoons all-purpose flour
• 2 cups heavy whipping cream
• 1/2 cup chicken broth
• 1/2 cup milk
• 2 cups shredded romano cheese
• 1 1/2 cups shredded part-skim mozzarella cheese
• SAUCE AND MEATBALLS
• 1 pound ground beef chuck
• 1 small onion
• 5 cloves garlic chopped
• 1/2 cup rice cereal crumbs, divided
• 1/2 cup milk
• 1 large egg
• 6 tablespoons chopped flat-leaf parsley, divided
• - salt to taste
• 1 tablespoon extra-virgin olive oil
• 2 jars marinara sauce