Lightly grease crock pot insert with cooking spray.
If browning the chicken, heat 1 tablespoon olive oil in a skillet and brown all chicken pieces, 2 minutes per side.
Place chicken breasts on the bottom of the crock pot, one next to another, and season with salt and pepper.
In a mixing bowl, combine orange preserves, orange juice, soy sauce, garlic and ginger; mix until combined.
Pour over the chicken.
Cover and cook on LOW for 4 to 5 hours, or on HIGH for 2.5 to 3 hours.
In the meantime, prepare the sesame seeds.
In a frying pan, heat the sesame seeds over medium heat, shaking the pan frequently, cooking just until fragrant; about 30 seconds. Set aside.
Remove chicken from slow cooker and transfer to a plate.
Spoon the orange sauce over chicken.
Garnish with sesame seeds and serve.