Place the brown rice noodles in a bowl of hot water and soak for 10-15 minutes until softened but still firm, then drain.
In a small bowl, whisk together the tamarind paste, fish sauce, coconut aminos, and lime juice to create the Pad Thai sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the garlic and shrimp to the skillet, sautéing for 2-3 minutes until the shrimp are pink and opaque.
Push the shrimp to one side of the pan and crack the egg into the empty space, scrambling it until just set.
Add the drained noodles and the prepared sauce to the skillet, tossing everything together for 2 minutes to coat the noodles evenly.
Fold in the bean sprouts and green onions, cooking for just one more minute so the sprouts stay crunchy.
Serve immediately topped with crushed peanuts and red pepper flakes for a hint of heat.