Start by preparing the noodles according to package directions. Strain and toss in a little bit of neutral oil to help prevent sticking.
Whisk together sesame past, sesame oil, rice wine vinegar, tamari, maple syrup, garlic and red pepper flakes, if using. Add warm water by the tablespoon and whisk until you achieve a nice consistency (you should be able to pour the mixture).
To assemble, dress the noodles in the sauce, divide into two portions and top with cucumbers, roasted peanuts, sesame seeds, scallions and chili oil to taste.