Place the brown rice noodles in a large bowl and cover with boiling water, soaking for 5-7 minutes until tender but firm, then drain and set aside.
In a small jar, whisk together the tamari, lime juice, honey, fish sauce, and red pepper flakes to create the pad thai sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat, then add the shrimp and minced garlic, sautéing until the shrimp turn pink and opaque.
Push the shrimp to one side of the pan, crack the egg into the empty space, and scramble it quickly until just set.
Add the drained noodles, sliced scallions, and the prepared sauce to the skillet, tossing everything together for 2 minutes to coat the noodles thoroughly.
Stir in the fresh bean sprouts during the last 30 seconds of cooking to maintain their crunch before serving immediately.