Place the rice noodles in a bowl of very hot water and soak for about 20 minutes until tender but firm, then drain and set aside.
In a small bowl, whisk together the tamari, fish sauce, lime juice, honey, and red pepper flakes to create the pad thai sauce.
Slice the chicken breast into thin bite-sized strips and season with sea salt and black pepper.
Heat the avocado oil in a large skillet or wok over medium-high heat, add the chicken, and sauté until golden and cooked through.
Add the minced garlic to the skillet and cook for 30 seconds until fragrant, then push the chicken to one side of the pan.
Crack the egg into the empty side of the pan and scramble quickly until just set, then mix it into the chicken.
Add the drained noodles and the prepared sauce to the skillet, tossing everything together for 1-2 minutes until the noodles are well coated and hot.
Fold in the bean sprouts and sliced green onions, cooking for just 30 seconds to retain their crunch.
Serve immediately topped with crushed peanuts and an extra squeeze of lime if desired.