Soak the brown rice noodles in a bowl of very hot water for 8-10 minutes until al dente, then drain and set aside.
In a small bowl, whisk together the tamari, lime juice, fish sauce, and maple syrup to create the stir-fry sauce.
Heat the avocado oil in a large wok or non-stick skillet over medium-high heat.
Add the shrimp and minced garlic to the pan, sautéing for 2-3 minutes until the shrimp are pink and opaque.
Push the shrimp to the outer edges of the pan and crack the egg into the center, scrambling it quickly until just set.
Add the drained noodles, mung bean sprouts, and the prepared sauce to the pan.
Toss all ingredients together vigorously for 1-2 minutes until the noodles are well-coated and the sprouts have slightly softened.
Remove from heat and garnish with sliced green onions, crushed peanuts, and red pepper flakes before serving.