Prepare the brown rice noodles according to package instructions until al dente, then drain and set aside.
In a small bowl, whisk together the tamari, lime juice, fish sauce, honey, and red pepper flakes to create the pad thai sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the shrimp to the skillet and sear for 2 minutes per side until pink and opaque, then remove and set aside.
In the same skillet, add the minced garlic and sliced scallions, sautéing for 30 seconds until fragrant.
Push the aromatics to the side, crack the egg into the center, and scramble until just set.
Add the cooked noodles, bean sprouts, and prepared sauce to the skillet, tossing everything together for 1-2 minutes until well coated and heated through.
Return the shrimp to the pan and toss briefly to combine.
Serve immediately, topped with crushed peanuts and fresh cilantro.