If you have one, line a slow cooker 3 to 6 quart with a liner. Liner are my preferred method of cleaning.
Sprinkle 1 tablespoon olive oil on the bottom of your slow cooker or liner.
Add the chicken to a gallon-sized ziptop bag. Seal bag and turn on to coat. Place chicken in slow cooker until evenly distributed.
Add the orange marmalade to a 2-cup measuring bowl or medium bowl. Then add the soy sauce and rice wine vinegar, sesame seed oil, ginger (I prefer 1 teaspoon, but some people are sensitive), garlic, and remaining 1 tablespoon olive oils. Stir to combine.
Use a spoon to spread the sauce over the chicken. Make sure that all pieces are covered.
Cook on high for 2 hours, or low for 4 hours. Start checking the temperature at 90 minutes if you are cooking on high. If you cook on low, check at 3 hours. Slow cookers are different so cook the chicken until it is cooked (reaches 165F using an instant-read thermometer).
Serve the chicken on a plate. Add as much cooking sauce as you like, and garnish it with sesame seeds, green onion, or orange wedges.