Preheat your oven to 350°F (175°C).

In a skillet, brown the ground beef with the chopped onion over medium heat. Stir frequently for 5-7 minutes until the beef is no longer pink and the onion is translucent.

Drain the excess grease from the meat mixture, then return it to the skillet. Mix in the cream of mushroom soup, Worcestershire sauce, frozen vegetables, salt, and pepper. Stir until everything is well combined and heated through for about 3-5 minutes.

Transfer the mixture to a greased 9x13-inch baking dish, spreading it evenly.

Sprinkle the shredded cheese evenly over the top.

Bake in your preheated oven for 30-35 minutes, or until the cheese is bubbly and slightly golden.

Let it cool for a few minutes before serving.