Soak rice noodles in hot water according to package instructions until al dente, then drain.
Whisk tamarind paste, coconut aminos, and fish sauce in a small bowl to create the sauce.
Heat avocado oil in a large skillet or wok over medium-high heat and sauté garlic until fragrant.
Add shrimp to the skillet and cook until pink and opaque, then push them to one side.
Crack the egg into the empty side of the pan, scramble until set, and mix with the shrimp.
Toss in the cooked noodles, bean sprouts, and sauce, stirring constantly until everything is well coated and heated through.
Garnish with sliced green onions, crushed peanuts, red pepper flakes, and a squeeze of fresh lime juice.