Cook the rice (instructions here). In a medium bowl, mix together the scallion, garlic, soy sauce, 1 tablespoon oil (if using, see note), and ¼ teaspoon salt. Add the chicken and use your hands to mix until combined. Form into 12 meatballs.
In a large skillet with a lid, warm 1 tablespoon of oil over medium-high heat. Arrange the meatballs in the skillet. Cook, covered, for 3-5 minutes or until golden on the bottom, adjusting the heat as needed. Use a spatula to flip each meatball, then cover and cook for another 3-5 minutes or until cooked through (165F). You may need to flip them again if they are burning on one side. Transfer to a plate or bowl.
To the skillet, add the broccoli/peppers, remaining ¼ teaspoon salt, and a splash of water (about 2 tablespoons). Use a spatula to scrape up any bits stuck to the pan and mix the veggies. Cover and cook for 2 minutes, then remove the lid and cook until the water evaporates, about 1 more minute or until veggies are tender.
To make the sauce, add all ingredients to a high-speed blender and blend until smooth. Taste and add more salt or acid, if needed.
Serve the meatballs and broccoli with rice and any other add-ins, then slather the sauce all over. Top with herbs and lime, if using.