In a large, non-stick skillet over medium-high heat, heat oil.
Add ground beef, the chopped onion and chopped jalapeno if using, with the kosher salt.
Using a wooden spatula or ground meat chopping tool, break beef into small pieces as the mixture cooks.
Cook until onions are soft and translucent and beef is cooked through, 8 to 10 minutes.
Add the tomato sauce, cumin, chili powder, oregano, garlic powder, and cornstarch and stir to combine evenly with the meat and onions.
Let mixture simmer in the tomato sauce until sauce is glossy, about 2 minutes.
Remove from heat and serve.
