Prepare the brown rice noodles according to the package instructions until al dente, then drain and set aside.
In a small bowl, whisk together the tamari, fish sauce, lime juice, coconut sugar, and red pepper flakes to create the sauce.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the shrimp to the skillet and cook until they are pink and succulent, approximately 2 to 3 minutes.
Stir in the minced garlic and cook for 30 seconds until the aroma is released.
Add the prepared noodles and the sauce mixture to the skillet, tossing vigorously to coat everything evenly.
Fold in the bean sprouts and sliced green onions, cooking for just 1 minute until they are slightly wilted but still crisp.
Transfer to a plate and garnish with the crushed peanuts before serving.