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, maple syrup, and red pepper flakes to create the sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the shrimp to the skillet and cook for 2-3 minutes until they are pink and opaque, then remove them and set aside.
In the same skillet, crack the egg and scramble it quickly until it is just set.
Add the cooked noodles, shrimp, bean sprouts, and sliced scallions back into the skillet.
Pour the prepared sauce over the mixture and toss continuously for 1-2 minutes until the noodles are well-coated and heated through.
Garnish the dish with crushed peanuts and fresh cilantro before serving immediately.