Veggie Lo Mein Noodles

Name: Veggie Lo Mein Noodles
Ingredients: 6 tablespoons Gluten-free tamari or soy sauce; 2 teaspoon sesame oil; 2 teaspoon sugar; 1/2 teaspoon corn starch (optional, but we prefer a thicker sauce so add the cornstarch); 12 ounces gluten-free Spaghetti noodles (prepared al dente according to package); 1-2 tablespoons sesame oil (enough to just cover base of pan); 1 bunch green onions (chopped (separate green parts from white parts)); 3-4 cups julienne cut or chopped vegetables (Here I used carrots, yellow squash, red pepper, mushroom, broccolini, and bok choy); 1-2 tablespoons mirin