Brown ground beef and add onion; cook until onion is transparent.
Add soup, veggies and garlic and mix, pour into a oblong baking dish.
Spread mashed potatoes on top and sprinkle with cheese.
Bake at 350°F for 30 minutes.
•Looking for a variation on this recipe? Try this: Instead of topping with mashed potatoes and cheese, top the casserole with a single layer of tater tots instead. This is also a big hit.