Place the brown rice noodles in a bowl of very hot water and soak for 10-15 minutes until tender but still firm, then drain.
In a small jar, whisk together the tamarind paste, coconut aminos, fish sauce, and maple syrup until the sauce is smooth.
Heat the avocado oil in a large skillet or wok over medium-high heat and sauté the diced chicken and minced garlic until the chicken is browned and cooked through.
Push the chicken to one side of the pan, crack the egg into the empty space, and scramble it quickly until just set.
Add the drained noodles and the prepared tamarind sauce to the pan, tossing everything together for 2 minutes to coat the noodles thoroughly.
Fold in the bean sprouts, sliced green onions, and red pepper flakes, cooking for just 1 minute more to maintain the crunch of the vegetables.
Plate the noodles and garnish with crushed peanuts and a fresh lime wedge before serving.