Begin by peeling and quartering one medium onion. This will add a lovely sweetness to the dish as it cooks.
Next, cut two lemons in half. The fresh juice and zest will infuse the chicken with bright flavor.
Coarsely chop one cup of fresh herbs. This can include any mix you enjoy, such as parsley, thyme, rosemary, or sage.
Remove the giblets from a 5-7 pound whole chicken. This is important for achieving the best flavor and texture.
Place the whole chicken in your slow cooker. It should fit comfortably, with some space around it for the heat to circulate.
Season the chicken liberally, inside and out, with 2 teaspoons of kosher salt and 1/2 teaspoon of ground black pepper. Don’t be shy; this is what brings out the flavor!
Now, stuff the chicken with the onion, lemons, and chopped herbs. If it doesn’t all fit, you can place some of these ingredients around the outside of the chicken.
Cover the slow cooker and cook on low for 6 to 8 hours, or until the chicken is fully cooked through. No additional liquid is needed, as the chicken will release its juices.
If desired, for a crispy skin, broil the chicken for 5 to 8 minutes after cooking. Transfer it to a baking dish and place it under the broiler.
Let it rest for about 5 minutes before carving the chicken and serving. This allows the juices to redistribute for maximum flavor.