Start by patting the chicken dry and add it to a bowl with the soy sauce, maple syrup, rice vinegar, hoisin, oyster sauce, and sesame oil. Toss until every piece is well coated, then set it aside while your pan heats up.
Heat the avocado oil in a skillet over medium heat and let it get very hot before adding the chicken. Add the chicken and don't touch it for 5 minutes.
Flip, then pour in 1/4 cup of the remaining marinade and let it cook undisturbed for another 5 minutes, until the chicken reaches an internal temperature of 165°F. Transfer the chicken to a plate.
Reduce the heat to low and add the garlic, ginger, and scallions straight into the same pan, scraping up all the browned bits from the bottom as you stir. Let that cook for 2 to 3 minutes, then pour in the broth along with the soy sauce and rice vinegar. Stir and let it warm through to your liking, then pull it off the heat.
Divide the cooked rice between four bowls. Slice the chicken and layer it on top of the rice, then pour the warm broth right over everything. Finish with extra scallions or pickled onions if you're using them, and serve right away.