Preheat oven to 350°F (175°C).

Brown hamburger in a skillet over medium heat.

Drain off excess grease from the hamburger.

In a 4-quart casserole dish, layer the cubed potatoes, sliced carrots, drained peas, and drained corn.

Season vegetables with salt and pepper to taste.

Spread the browned hamburger evenly over the vegetables.

Pour the onion soup over the hamburger and vegetables.

Prepare the cornbread mix according to package directions.

Spread the cornbread mix evenly over the soup layer.

Bake uncovered in the preheated oven for 1 hour and 15 minutes, or until the vegetables are tender and the cornbread is golden brown.