Cooking in a slow cooker is simple, efficient and does not heat up the kitchen. A whole chicken can be cooked in the matter of a few hours. One chicken can be used to make several different meals and homemade broth. With a few steps, a chicken in a slow cooker can taste just like one cooked in an oven.
Plug in slow cooker and set to low. Spread 1 to 2 tablespoons of oil in the bottom of the slow cooker.
Break off four 2 inch wide pieces of aluminum foil. Form each into a golf-ball sized ball and place in the bottom of the slow cooker in the shape of a rectangle.
Unwrap the chicken. Wash it with water and pat the skin dry with a paper towel. Remove the bag of innards from the cavity.
Chop the onion half into four pieces. Insert the garlic cloves, onion and rosemary into the cavity.
Place the chicken in the slow cooker breast-side up. By resting the chicken on top of the aluminum balls, the chicken will cook more like it is in a roasting pan in the oven.
Rub 1-2 tablespoons of oil onto the chicken. The oil on the skin helps to make the skin crispy like an oven-roasted chicken. Sprinkle salt, pepper and dried sage to taste onto the skin.
Place the lid on the slow cooker. Cook the chicken on low for 6 to 8 hours. Remove the chicken from the slow cooker and serve.