Whisk together all of the ingredients for the sauce in a measuring cup and set aside until ready to use.
To make the stir fry:
Heat 1 teaspoon of oil in a large skillet over high heat. Once hot, add the beef to the skillet and let sit without moving it around for 3-4 minutes to sear. Break apart the meat and continue cooking until browned through. We leave the chunks a bit larger than we would for something like tacos, but break it up as much as you like. Remove to a plate.
Heat the remaining teaspoon of oil in the skillet (no need to clean it first) and then add in the bell pepper and green beans. Cook, stirring often, for about 4 minutes or until the vegetables are tender-crisp.
Add the garlic and green onions and cook for 30 seconds more.
Stir the ground beef back into the skillet along with the sauce. Let cook for about 3-4 minutes on high heat for the sauce to reduce down a bit.
Sprinkle with the sesame seeds just before serving and add salt to taste.
Notes
Sauce: I like to use reduced sodium soy sauce here so that I can salt to taste at the end, but if all you have is regular, go ahead and use that. Your results will be a bit saltier. You can add more or less chili paste, depending on how spicy you’d like the sauce.Protein: I usually make this with ground beef, but it also works well with ground turkey or chicken. I’ve even made it with shaved steak and that was also delicious.Veggies: Any color bell pepper will work here. Fresh green beans have the best texture, in my opinion, but I’ve made this with canned in a pinch and it was delicious! You could also sub broccoli florets for the green beans. If you’re not super strict on carbs, tossing in ¼-½ cup of shredded carrots is delicious too.