Chicken Alfredo Stuffed Manicotti

Ingredients (9)

• + 4 cups chicken stock, or as needed add to pantry
• + 3 skinless, boneless chicken breasts add to pantry
• + 1 (8 ounce) package manicotti shells add to pantry
• + 3 cups shredded mozzarella cheese, divided add to pantry
• + 1 (8 ounce) package cream cheese, softened add to pantry
• + 1 (8 ounce) package fresh mushrooms, finely chopped add to pantry
• + ¼ cup chopped green onions add to pantry
• ✓ 3 cloves garlic, minced
• + 2 (16 ounce) jars Alfredo sauce add to pantry