Cook noodles according to package instructions, less one minute. Do not overcook. Drain and set aside.
In a large skillet over medium-high heat, heat oil and saute onions and red pepper slices 2-3 minutes until translucent.
Stir in green onions and garlic and cook for one minute. Add shrimp and saute about 4 minutes until just cooked, they will be pink. Remove from pan and set aside.
Add soy sauce, chili garlic sauce, lime juice, brown sugar, and Sriracha (optional). Simmer on low until sauce has reduced slightly, 3 to 5 minutes.
Add shrimp and cooked noodles and toss to combine. Garnish with additional green onions.
Notes
I like to serve these noodles with Spring Rolls and a steamed green vegetable. Broccoli and Sugar Snap peas are two good options.