Spray a 3 1/2-4 quart slow cooker with nonstick cooking spray. Put the chicken breasts in the bottom of the slow cooker.
In a small bowl, combine the ginger, teriyaki glaze, orange marmalade and garlic. Mix well and pour over the chicken.
Cook on low for 6 hours, or until the chicken is cooked through.
Remove the chicken to a plate and shred or cut into bite-sized pieces. Pour the liquid into a saucepan. Return the chicken to the slow cooker.
In a small bowl, combine the 2 tablespoons of water and 1 tablespoon of cornstarch. Add to the pan with the liquid. Cook over medium-high heat until the liquid has thickened, then pour back into the slow cooker and stir to coat the chicken. Stir in the sesame seeds.
Serve over prepared rice.
Notes
You want a thicker teriyaki sauce - not the super liquid teriyaki sauce. My homemade teriyaki sauce is nice and thick. If you want to use a store bought version, use teriyaki glaze instead of teriyaki sauce.*Note - different slow cookers cook at different temperatures. Start checking your chicken earlier for doneness if yours cooks faster.*