Clean and prep the shrimp thoroughly.
Slice the onion and green onion into thin strips.
Cook the noodles in boiling water and drain.
Heat oil in a pan and stir-fry the shrimp.
Add the sliced vegetables and stir-fry together with the shrimp until done.
Combine peanut butter, soy sauce, sugar, and chili oil to make the sauce.
Add the cooked noodles and sauce to the pan, stir-fry and mix everything well.
Transfer to a plate and finish with a sprinkle of crushed peanuts.