Slow cooker Philly cheese chicken tacos from Nutritionist in the Kitch is a an easy meal for any night of the week. Chicken breasts are simmered low and slow with onions, peppers, and a variety of spices. After cooking for three hours in the crock pot, all the flavors meld and become something delicious. The chicken taco filling is served in corn tortillas and melted mozzarella cheese. To make these tacos for your family, click here.