Place the dry brown rice noodles in a bowl of very hot water to soak for 8-10 minutes until tender but firm, then drain and set aside.
In a small jar, whisk together the tamari, lime juice, coconut sugar, rice vinegar, and red pepper flakes until the sugar is fully dissolved.
Heat the avocado oil in a large wok or non-stick skillet over medium-high heat and sear the shrimp for 2 minutes per side until they turn pink and opaque.
Push the shrimp to one side of the pan and crack the egg into the empty space, scrambling it quickly with a spatula until just set.
Add the minced garlic, sliced green onions, and bean sprouts to the pan, sautéing for 1 minute until the aromatics are fragrant.
Toss in the drained noodles and pour the prepared sauce over the entire mixture, using tongs to coat everything evenly until the sauce thickens and the noodles are glossy.
Transfer to a plate and garnish with crushed toasted peanuts and an extra squeeze of fresh lime juice if desired.