Add chicken to crock pot and sprinkle with salt and pepper. Spread pesto over chicken and squeeze the lemon juice on top. Cut butter into slices and lay over top of chicken
Cover and cook on low for 5-6 hours.
Near the end of the cooking time, cook the pasta according to package directions and drain well.
Shred chicken and then add the cooked pasta and parmesan cheese, stirring until pasta is coated with butter pesto sauce and chicken is evenly mixed.
Add the mozzarella cheese and cover with lid on low for apprx 10 minutes unitl the cheese is melted.
Garnish with basil, serve and enjoy!