Preheat the oven to 375°F. In a bowl, whisk together the soy sauce, sriracha, and sesame oil. Add in the chicken cubes and toss to combine.
Whisk together the garlic powder, onion powder, paprika, salt, and flour. Add it to the chicken and toss the cubes to fully coat them in the flour.
Heat the vegetable oil in a skillet over medium-high heat. Once heated, add in the chicken pieces and cook for a few minutes until browned on all sides, but not cooked through. Work in batches if needed. Transfer the chicken to a plate.
Whisk together the bang bang sauce ingredients in a bowl.
Add the rice to a greased casserole dish. Then, pour in the chicken broth and ⅓ cup of the bang bang sauce. Stir to combine.
Spread the chicken pieces out over the top of the rice.
Bake for 30 minutes.
Combine the panko breadcrumbs and oil. Sprinkle the mixture over the casserole. Then, continue baking for another 10 minutes until golden brown.
Finish with a drizzle of the remaining bang bang sauce and a sprinkle of green onions and sesame seeds. Add extra bang bang sauce if desired before serving for an even creamier texture.