Prepare the brown rice noodles according to package directions by soaking in hot water 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 savory and tangy Pad Thai sauce.
Heat the sesame oil in a large skillet or wok over medium-high heat and sauté the minced garlic until fragrant, about 30 seconds.
Add the shrimp to the skillet and cook for 2-3 minutes until they turn pink and opaque, then push them to one side of the pan.
Crack the egg into the empty side of the pan, scrambling it quickly until just set before mixing it in with the shrimp.
Add the prepared noodles and the sauce mixture to the pan, tossing everything together for 1-2 minutes until the noodles are well coated and heated through.
Fold in the bean sprouts and sliced green onions, cooking for just 30 seconds more to maintain the vegetables' crisp texture.
Plate the noodles and garnish with crushed peanuts and red pepper flakes for a satisfying crunch and a hint of heat.