Prepare the brown rice noodles according to package instructions by soaking in hot water until al dente, then drain and set aside.
In a small bowl, whisk together the tamari, fish sauce, maple syrup, lime juice, and red pepper flakes to create the pad thai sauce.
Heat the avocado oil in a large wok or skillet over medium-high heat and add the minced garlic, sautéing for 30 seconds until fragrant.
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, scramble it quickly until set, and then mix it in with the shrimp.
Add the cooked 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 through.
Remove from heat and stir in the green onions and crushed peanuts before serving.