Soak your rice noodles in tap-hot water for 10 minutes. Start this while you build the sauce and it will be ready by the time you need to add them.
Shrimp
Pat shrimp completely dry. Heat a wide skillet over high heat and add your butter. Add shrimp in a single layer without crowding and season with salt and pepper. Sear 60-90 seconds without touching. Remove shrimp immediately as they finish cooking off the heat.
Sauce
In the same pan over medium heat, add remaining butter. Add garlic and cook 30 seconds. Add chili crisp, soy sauce, sesame oil, and sugar. Stir and let sizzle 30 seconds.
Noodles
Add noodles and stock to the pan. Toss and press noodles into the sauce. Let simmer and reduce 2-3 minutes, tossing constantly. Add a splash more stock or water if it tightens too fast. Add back your shrimp.
Plate
Finish with scallions, a heavy chili crisp drizzle, and a lime wedge on the side.