Preheat oven to 450ºF.
Heat oil in a large skillet over medium heat.
Add onion and garlic. Season with salt and pepper.
Cook, stirring occasionally, until onion is soft, 3 to 5 minutes.
Add beef and cook, breaking it up with a spoon, until no longer pink, 4 to 5 minutes.
Add soup, ketchup, and Worcestershire and cook, stirring occasionally, until warmed through, about 1 minute.
Add green beans, peas, and corn. Cook, stirring occasionally, until warmed through about 1 minute.
Remove from heat and stir in cheddar until melted.
