Place chicken breasts in the slow cooker in a single layer
Season with salt, pepper, and desired spices
Add 1/2 to 1 cup of liquid such as broth, water, or sauce
Cover with the lid
Cook on low for 3 to 4 hours or on high for 2 to 3 hours
Check that the internal temperature reaches 165°F
Remove the chicken from the slow cooker
Let it rest for a few minutes before slicing or shredding
Avoid overcooking to keep the chicken from drying out