This slow-cooker chicken dinner ticks all the boxes for an easy and family-friendly weeknight dinner that's healthy, hearty and comforting. Boneless, skinless chicken thighs become super tender as they cook, and the apples help thicken the creamy sauce that’s lightly sweetened with apple cider. Mustard, parsley and fennel fronds bring fresh notes for balance and egg noodles added at the end help sop up the delicious sauce.