Preparing Chicken Onigiri involves several simple steps. Just follow these guidelines to create your own delicious rice balls:

1. Rinse the Rice: Measure 2 cups of sushi rice and rinse it under cold water until the water runs clear. This helps remove excess starch.
2. Cook the Rice: Combine the rinsed rice and 2 ½ cups of water in a rice cooker or saucepan. Cook according to the rice cooker instructions or bring to a boil, then reduce to low heat, cover, and simmer for about 15-20 minutes until all water is absorbed.
3. Prepare the Seasoning: In a small bowl, mix 1 tablespoon of rice vinegar, 1 tablespoon of sugar, and 1 teaspoon of salt until dissolved. Once the rice is cooked, transfer it to a large bowl and gently fold in the seasoning mixture.
4. Let the Rice Cool: Allow the rice to cool slightly but keep it warm and pliable for shaping.
5. Prepare the Chicken Filling: In a medium bowl, combine the shredded chicken with 2 tablespoons of soy sauce, 1 tablespoon of sesame oil, and optional chopped green onions. Mix well.
6. Shape the Onigiri: With wet hands, take about ¾ cup of seasoned rice and flatten it slightly in your palm. Add a tablespoon of the chicken filling in the center, then mold the rice around it, forming a triangular shape.
7. Wrap with Nori: Cut the nori sheets into strips or triangles. Wrap a piece around the base of your rice ball for added flavor and to help hold it together.
8. Garnish (Optional): Sprinkle sesame seeds over the top for a nice finish.
9. Serve Warm: Enjoy immediately, or pack into lunch boxes for later.

With these uncomplicated steps, you'll be able to impress anyone with your homemade Chicken Onigiri!