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, fish sauce, lime juice, and coconut sugar to create the stir-fry sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat and sauté the minced garlic and shrimp until the shrimp are pink and opaque.
Push the shrimp to one side of the pan, crack the egg into the empty space, and scramble until just set.
Add the cooked noodles, bean sprouts, and half of the sliced green onions to the skillet, then pour the prepared sauce over the mixture.
Toss everything together for 1-2 minutes until the noodles are well-coated and the bean sprouts are slightly wilted.
Serve immediately topped with crushed peanuts, the remaining green onions, red pepper flakes, and fresh cilantro.