Creating Cheesy Ground Beef & Rice Casserole is straightforward if you follow these simple steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C).
2. Cook the Beef: In a large skillet, heat olive oil over medium heat. Add the chopped onion and minced garlic, cooking until softened. Add the ground beef, breaking it apart as it browns. Season with salt, pepper, and paprika.
3. Add Rice and Broth: Once the beef is fully cooked, stir in the rice and beef broth (or water). Bring to a boil, then reduce heat to low. Cover and simmer for about 15 minutes, or until the rice is tender and has absorbed the liquid.
4. Mix in Soup and Cheese: Remove from heat and stir in the cream of mushroom soup, milk, and half of the shredded cheddar cheese. If using, add the frozen mixed vegetables at this stage.
5. Transfer to Casserole Dish: Pour the mixture into a greased 9×13 inch casserole dish, spreading it evenly.
6. Top with Cheese: Sprinkle the remaining cheddar cheese on top of the casserole.
7. Bake: Bake in the preheated oven for 30-35 minutes, or until the cheese is bubbly and golden brown.
8. Cool and Serve: Let the casserole cool for a few minutes before serving. This allows it to set up a bit for easier slicing.

These steps will guide you in creating this incredible casserole effortlessly!