Place the brown rice noodles in a bowl of very hot water to soak for 8-10 minutes until al dente, then drain.
In a small jar, whisk together the tamari, fish sauce, tamarind paste, maple syrup, and red pepper flakes until smooth.
Heat the avocado oil in a large wok or skillet over medium-high heat and add the minced garlic, sautéing for 30 seconds.
Add the shrimp to the pan and cook for 2 minutes per side until pink and opaque, then push them to the outer edges of the pan.
Crack the egg into the center of the pan, scrambling it quickly with a spatula until just set.
Toss in the drained noodles and the prepared sauce, stir-frying for 1-2 minutes until the noodles are well-coated and glossy.
Fold in the bean sprouts and sliced green onions, then remove from heat to keep the sprouts crisp.
Serve immediately topped with chopped peanuts and a fresh squeeze of lime juice.