Start by trimming any excess fat from the chicken breasts.
In a bowl, combine the teriyaki sauce, soy sauce, chicken broth, brown sugar, minced garlic, and sesame oil. Stir until the brown sugar is fully dissolved.
Lay the chicken breasts in the bottom of the slow cooker. Pour the sauce mixture evenly over the chicken.
Cover the slow cooker and cook on low for 6-7 hours or on high for 3-4 hours.
Once cooked, shred the chicken and return it to the slow cooker, stirring to coat in the sauce.
Serve the chicken over rice or in lettuce wraps, garnished with sesame seeds.