Preheat your oven to 350°F (175°C).
In a large skillet, heat the olive oil over medium heat. Add the diced onion and minced garlic, cooking until the onion is translucent, about 3-4 minutes.
Add the ground beef to the skillet, breaking it apart with a spatula. Cook until browned and fully cooked, about 5-7 minutes. Drain excess fat if necessary.
Stir in the rice, cream of mushroom soup, beef broth, salt, pepper, and Italian seasoning. Mix well and bring to a simmer. Cook for about 5 minutes.
Remove the skillet from heat and fold in the frozen mixed vegetables and half of the shredded cheddar cheese.
Transfer the mixture into a 9x13-inch baking dish, spreading it evenly.
Cover the dish with aluminum foil and bake in the preheated oven for 30 minutes.
After 30 minutes, remove the foil and sprinkle the remaining cheddar cheese on top. Return to the oven and bake for an additional 10-15 minutes until the cheese is melted and bubbly.
Allow to cool for a few minutes before serving.