Step 1: Season the Chicken - Place the diced chicken directly into the slow cooker. Sprinkle the salt, black pepper, garlic powder, and ground ginger over the chicken. Give it a quick stir so the seasonings coat the pieces evenly.
Step 2: Add the Sauces - Pour the soy sauce, teriyaki sauce, sesame oil, and chicken broth over the seasoned chicken. These liquids will slowly cook the chicken while building the savory base of the dish.
Step 3: Add the Vegetables - Stir in the diced onion along with the frozen carrots and peas. Spread everything evenly so the vegetables cook alongside the chicken.
Step 4: Slow Cook - Cover the slow cooker with the lid and cook on low for about three to four hours. The chicken should be fully cooked and very tender by the end of this time.
Step 5: Scramble the Eggs - Push the chicken mixture slightly to one side of the slow cooker. Pour the beaten eggs directly onto the hot surface and stir quickly to scramble them until they are set.
Step 6: Add the Rice - Add the cooked and cooled white rice to the slow cooker. Stir gently to combine everything evenly while keeping the rice grains fluffy.
Step 7: Finish and Serve - Let the rice warm through for a few minutes. Taste and adjust seasoning if needed. Sprinkle sliced scallions over the top before serving.