Soak the brown rice noodles in very hot water for 20-30 minutes until pliable but still firm, then drain.
In a small bowl, whisk together the fish sauce, tamarind paste, coconut sugar, and red pepper flakes to create the sauce.
Heat avocado oil in a large skillet or wok over medium-high heat and sear the shrimp and cubed tofu until the shrimp is pink and tofu is golden.
Push the shrimp and tofu to one side of the pan, crack the egg into the empty space, and scramble until just set.
Add the minced garlic, drained noodles, and sauce to the pan, tossing vigorously for 2 minutes until the noodles are tender and coated.
Fold in the bean sprouts and sliced green onions, then remove from heat.
Serve immediately topped with crushed peanuts and a fresh squeeze of lime juice.