Boil the noodles according to package instructions. Drain noodles well. Add about ½ tablespoon of cooking oil to the bottom of a large sheet tray. Toss the drained noodles in the oil, and spread out in a thin even layer on the tray. Allow the noodles to cool completely before starting your stir fry. You can also cover the sheet tray with plastic wrap and place in the refrigerator overnight.
When noodles are cool, prepare the sauce by mixing soy sauce, oyster sauce, mirin, and crunchy garlic chili sauce in a medium bowl. Set aside.
Drain shrimp if needed, and cut each shrimp into 3 equally-sized pieces.
Preheat griddle or large skillet to medium heat. For griddle cooking, aim for a griddle temperature of about 400°F.
Add about 1 tablespoon of cooking oil to the heated griddle or skillet. Begin sautéing the diced onions and the whites of the sliced green onions. When onions are about halfway done, add the peas and carrots mix. Stir to combine, and continue to sauté until vegetables are about 75% done. Then move to the side of the griddle, or for skillet cooking, remove from the skillet and set aside.
Add about 1 tablespoon of cooking oil to the griddle or skillet and spread it around a bit. Spread the noodles out in an even layer on the oiled surface, and cook untouched for about 1-2 minutes. Then stir fry until warmed through.
Spread the noodles out in a thin even layer again. Make a "well" in the noodles. Add the butter and minced garlic to the well. Allow the garlic to cook in the butter for about 1-2 minutes to release the aromatic flavors of the garlic.
When the garlic becomes fragrant and has a bit of color to it, add the cut shrimp and sauté in the well with the butter and garlic. Cook the shrimp in the well until about 50% cooked through. Then mix the shrimp, butter, and garlic with the noodles.
Add the vegetables to the shrimp and noodles, and sauté everything together briefly, about 1 minute. Then pour the prepared sauce over the noodles.
Toss everything together, ensuring the sauce fully coats the noodles. Sauté for an additional 2-3 minutes. *Remember, the sauce will continue to thicken a bit as the noodles cool also.
Pour beaten eggs on the heated surface. Cook the eggs, then mix scrambled eggs in with the shrimp and noodle stir fry.
When all ingredients are well incorporated, pour the sesame oil over the shrimp and noodle stir fry. Sprinkle with green parts of the sliced green onions. Stir everything together one final time. Transfer to a serving dish, and sprinkle with sesame seeds and/or more sliced green onions for garnish. Serve with siracha, more soy sauce, or your favorite Asian condiments.