In a mixing bowl, combine the peanut butter, white miso paste, soy sauce, maple syrup, rice vinegar, grated ginger, and grated garlic. Stir until smooth and well mixed.
Add half of the peanut miso sauce to the chicken tenders and mix well, coating each piece.
Place the chicken and sauce mixture in a slow cooker.
Add a splash of chicken bone broth or water for moisture.
Cook on: High: 3-4 hours, or Low: 4-5 hours
Once cooked, add the remaining peanut miso sauce and stir.
Garnish with sesame seeds, black pepper, and red chili flakes if desired.