on low: Cover the slow cooker and cook on LOW for 2 1/2 to 3 hours, until the pasta is just tender. Every slow cooker has its own personality, so begin checking around the 2-hour mark. Give the mixture a gentle stir when you check it to help the pasta cook evenly.
Add the fresh spinach: Once the pasta is tender, add the fresh spinach by the handful, gently folding it into the hot pasta and sauce. The spinach will wilt
