Soak the brown rice noodles in hot water for about 10 minutes until tender, then drain and set aside.
In a small bowl, whisk together the tamari, fish sauce, maple syrup, lime juice, and red pepper flakes to create the sauce.
Heat the toasted sesame oil in a large skillet or wok over medium-high heat and sauté the minced garlic for 30 seconds until fragrant.
Add the shrimp to the skillet and cook for 2-3 minutes until pink and opaque, then push them to one side of the pan.
Crack the egg into the empty side of the skillet and scramble it quickly until just set.
Add the soaked noodles, bean sprouts, and the prepared sauce to the pan, tossing everything together for 2 minutes until the noodles are well coated.
Remove from heat and garnish with sliced green onions and crushed peanuts before serving warm.