Rinse the sauerkraut and drain. Give it a squeeze with your hands to remove extra water.
Place kraut in the crockpot that has been sprayed with cooking spray.
Add red pepper and rosemary and stir into the kraut.
Place chicken over kraut.
Mix lemon juice and olive oil. Brush on chicken, using all of the lemon juice/olive oil.
Sprinkle with salt and pepper.
Cook on high 5-6 hours or low 7-8 hours.