Preheat your oven to 375 degrees F (190 degrees C).
In a large oven-safe skillet or baking dish, brown the ground beef with the chopped onion. Drain off any excess grease.
Layer the sliced potatoes, carrots, corn, and green beans over the browned beef mixture.
Pour the beef broth over the ingredients and season with salt and pepper.
Cover the skillet or baking dish tightly with foil.
Bake for 45 minutes, or until the vegetables are tender and the casserole is bubbly. Remove the foil for the last 10-15 minutes of baking if you desire a crispier top.
Let it rest for a few minutes before serving.
Notes
This is a very adaptable recipe. Feel free to add other vegetables like peas or bell peppers. You can also add a layer of cheese on top during the last 10 minutes of baking for extra richness.