Heat a skillet over medium high heat. Add the oil and onion and sauté until translucent. Then add the ground beef, garlic powder, onion powder and salt.
Brown the beef, breaking it up as it cooks, until it is lightly browned and fully cooked through. Turn off the flame and set aside.
Make the special sauce. Add all of the ingredients to a small bowl and whisk together until well combined.
Assemble your burger bowls. Start with romaine lettuce then add the toppings of your choice and cooked ground beef. Drizzle the special sauce over everything, or serve on the side.