Bring a large pot of water to boil and add in egg noodles. Cook noodles, making sure to separate the strands as they cook, until noodles are al dente. Drain noodles and then run noodles under cold water to cool them down.
In a medium bowl, add sesame oil, rice vinegar, soy sauce, garlic, sriracha, peanut butter and sesame paste. Whisk until sauce is uniform (except for the garlic). Taste sauce and adjust as needed.
Add noodles to a large mixing bowl. Pour sauce over noodles and toss until noodles are evenly coated. Dish out noodles. Garnish with sesame seeds and scallions. Serve at room temperature or cold.
Notes
Seasoned rice vinegar is sweeter and less acidic than regular rice vinegar. You can substitute with regular rice vinegar but you may need to adjust the amount since regular rice vinegar has a much stronger flavor.
Toasted sesame oil has a more complex flavor compared to regular sesame oil and I think it helps enhance the sesame flavor in this recipe.
Chinese sesame paste is a thick paste made of toasted sesame seeds. It has a rich, creamy, and nutty flavor. It will enhance the sesame flavor in the sauce and thicken the sauce. However, Chinese sesame paste may be harder to find if you don't have any Asian grocery stores near you, so you can leave this out.
Nutrition estimate does not include the Chinese sesame paste.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.