1. Preheat your oven to 375°F (190°C). Grease a 9×13-inch baking dish and set aside.
2. In a large skillet over medium heat, cook the ground beef until browned, breaking it apart with a wooden spoon. Drain excess fat.
3. Add the chopped onion and minced garlic to the skillet, cooking until the onion is translucent, about 5 minutes.
4. Stir in the corn, mixed vegetables, cream of mushroom soup, sour cream, salt, and pepper. Mix until well combined.
5. Pour the beef mixture into the prepared baking dish, spreading it evenly.
6. Spoon the prepared mashed potatoes over the beef mixture, smoothing them into an even layer.
7. Sprinkle the shredded cheddar cheese atop the mashed potatoes, covering the surface completely.
8. Bake in the preheated oven for 25-30 minutes, or until the cheese is melted and bubbly, with a slight golden crust forming on top.
9. Remove from the oven and let cool for a few minutes before serving.

As you prepare this dish, remember Mama Lou’s gentle reminders of patience and love. Cooking is not just about the end result but the joy of the process, the connection with those around you, and the memories created along the way.