Soak the brown rice noodles in hot water according to package directions until tender, then drain and set aside.
In a small bowl, whisk together the tamari, fresh lime juice, and red chili flakes to create the pad thai sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Season the shrimp with sea salt and black pepper, then sear in the hot pan until pink and opaque, approximately 2-3 minutes.
Push the shrimp to one side of the pan, crack the egg into the empty space, and scramble until just set.
Add the minced garlic, bean sprouts, and cooked rice noodles to the pan.
Pour the prepared sauce over the ingredients and toss everything together for 1-2 minutes until the noodles are well-coated and steaming.
Garnish with sliced green onions and serve immediately while hot.