Soak the brown rice noodles in a bowl of very hot water for about 10 minutes until they are pliable but still have a firm bite.
In a small jar or bowl, whisk together the tamari, honey, lime juice, and red pepper flakes to create the pad thai sauce.
Heat the avocado oil in a large non-stick skillet or wok over medium-high heat and add the diced chicken, cooking until golden and opaque.
Stir in the minced garlic and the white parts of the sliced green onions, sautéing for 60 seconds until the aromatics are fragrant.
Move the chicken mixture to the edges of the pan, crack the egg into the center, and stir gently until the egg is fully scrambled.
Add the drained noodles, prepared sauce, and bean sprouts to the skillet, tossing everything together for 2 minutes until the noodles are tender.
Garnish the dish with crushed peanuts, fresh cilantro, and the remaining green onion tops before serving immediately.