Prepare the brown rice noodles according to package instructions until al dente, then drain and set aside.
In a small bowl, whisk together the tamari, lime juice, fish sauce, and coconut sugar to create the stir-fry sauce.
Heat the avocado oil in a large wok or skillet over medium-high heat and sauté the minced garlic until fragrant.
Add the shrimp to the pan and cook for 2-3 minutes until they turn pink and opaque, then push them to one side.
Crack the egg into the empty side of the pan, scramble it until just set, and then mix it with the shrimp.
Add the cooked noodles, bean sprouts, and the prepared sauce to the pan, tossing everything together for 1-2 minutes.
Stir in the sliced green onions and red pepper flakes, then remove from heat.
Serve immediately topped with crushed peanuts and fresh cilantro for a bright, flavorful finish.