Cook the Kraft Macaroni and Cheese according to package instructions.
In a skillet, brown the ground hamburger over medium heat until fully cooked. Drain excess fat.
In a large bowl, combine the cooked macaroni and cheese, ground hamburger, shredded cheddar cheese, cream of mushroom soup, milk, salt, and black pepper. Mix well.
Transfer the mixture to a baking dish and spread evenly.
Bake in the preheated oven for 20-25 minutes, or until the top is golden and bubbly.
Let cool for a few minutes before serving.
Notes:
This casserole is perfect for a quick and hearty meal. Feel free to add vegetables like peas or carrots for extra nutrition.