Mix your sauce ingredients and set aside: sesame oil, soy, sugar, and salt.
Add canola oil to your pan and sauté your onions until translucent; then add in your garlic and cook another 30 seconds or so.
Add in fresh veggies and sauté for a minute or so before adding in some salt.
Make sure not to cook the veggies too much since we want them to be crisp still and not mushy.
Then add in your cooked vermicelli noodles, and your sauce, and cook until the sauce has thickened and coated the noodles evenly.
Garnish with sesame seeds before serving and add your gochujang sauce in right before eating. I use the brand "chung jung one" and it's my favorite! (not sponsored lol)