Prepare the brown rice noodles according to package instructions, draining them just before they reach al dente to prevent mushiness.
In a small bowl, whisk together the tamari, lime juice, maple syrup, fish sauce, and red pepper flakes to create the Pad Thai sauce.
Heat the toasted sesame oil in a large wok or non-stick skillet over medium-high heat.
Add the minced garlic and shrimp to the pan, sautéing for 2-3 minutes until the shrimp are pink and opaque.
Push the shrimp to one side of the pan and crack the egg into the empty space, scrambling it quickly until just set.
Add the cooked noodles and the prepared sauce to the pan, tossing everything together for 1-2 minutes until the noodles are well-coated and hot.
Fold in the bean sprouts and sliced scallions, cooking for an additional 30 seconds until the sprouts are slightly wilted but still crisp.
Remove from heat and serve immediately, topped with crushed roasted peanuts and an extra squeeze of lime if desired.