Step 1

Heat oil in a large nonstick skillet over medium-high heat. Add beef and cook, breaking it up with a wooden spoon, until lightly browned but not completely cooked through, 3 to 4 minutes. Using a slotted spoon, transfer the beef to a medium bowl, reserving drippings in the pan.

Step 2

Add beans and onion to the pan; cook, stirring often, until the onion is softened, about 5 minutes. Add chile powder, garlic powder, onion powder and cayenne; cook, stirring constantly, until fragrant, about 30 seconds. Stir in tomato sauce, ketchup, Worcestershire, mustard and brown sugar. Return the beef to the pan. Bring to a simmer and cook, stirring often, until the beef is just cooked through and the sauce has thickened slightly, about 5 minutes. Serve on buns.