Soak the brown rice noodles in a bowl of very hot water for 8-10 minutes until tender but still firm to the bite, then drain and set aside.
In a small mixing bowl, whisk together the tamari, lime juice, maple syrup, and sriracha to create the Pad Thai sauce.
Heat the sesame oil in a large skillet or wok over medium-high heat and add the minced garlic, sautéing for 30 seconds until fragrant.
Season the shrimp with sea salt and black pepper, then add them to the skillet and cook for 2-3 minutes until 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 cooked through.
Add the soaked noodles, bean sprouts, and the prepared sauce to the pan, tossing everything together for 1-2 minutes until the noodles are well-coated and heated.
Remove from heat and garnish with sliced green onions and crushed peanuts before serving immediately.