Soak the brown rice noodles in a bowl of very hot water for 8-10 minutes until tender but firm, then drain and set aside.
In a small jar, whisk together the tamari, fish sauce, lime juice, and coconut sugar until the sugar is fully dissolved.
Heat the avocado oil in a large wok or non-stick skillet over medium-high heat and sauté the minced garlic for 30 seconds until fragrant.
Add the shrimp to the pan and cook for 2 minutes per side until pink and opaque, then push them to one side of the pan.
Crack the egg into the empty side of the pan, scramble it quickly until set, and then toss it together with the shrimp.
Add the drained noodles, the prepared sauce, and the red pepper flakes to the pan, tossing constantly for 2 minutes to coat everything evenly.
Fold in the fresh bean sprouts and sliced green onions, cooking for just 30 seconds more so the sprouts stay crisp.
Transfer to a plate and garnish with the crushed roasted peanuts before serving immediately.