Pour the tomato soup mixture evenly over the raw ground beef in the slow cooker, letting it completely cover the meat. This is the foundation of the casserole’s sauce.
Sprinkle the uncooked egg noodles evenly over the tomato-covered beef layer. Gently press them down with the back of a spoon so they settle slightly into the sauce.
In a small bowl, stir together the sour cream and half of the shredded cheddar cheese until well combined. Dollop this mixture over the noodles in several spoonfuls, then gently spread it into a loose, uneven layer. It doesn’t have to be perfect; it will melt and settle as it cooks.
Cover the slow cooker with the lid and cook on LOW for 4 to 5 hours, or on HIGH for 2 to 3 hours, until the ground beef is cooked through, the noodles are tender, and the casserole is bubbly around the edges. Avoid lifting the lid too often so the noodles cook evenly.
Once the casserole is done, sprinkle the remaining shredded cheddar cheese evenly over the top. Cover again and let it sit on LOW or WARM for about 10 minutes, just until the cheese melts.
Stir gently from the edges toward the center to lightly mix the layers without completely breaking them up. Taste and add salt and black pepper if you like, then serve hot straight from the slow cooker.
Variations & Tips
For a little extra garden flavor, you can add 1 teaspoon dried parsley or Italian seasoning to the tomato soup mixture before pouring it over the beef. If your family likes a bit of sweetness, stir 1 to 2 teaspoons of brown sugar into the soup to mimic old-fashioned tomato casseroles. You can swap the cheddar for Colby Jack or mozzarella, or use a blend to clean out the cheese drawer. Ground turkey or venison can stand in for the beef; just make sure you use a lean grind so the casserole doesn’t get greasy. To stretch the meal, add an extra cup of egg noodles and a splash more water, knowing it will be a bit thicker and more like a hearty hotdish. If you prefer a firmer casserole, let it sit on WARM for 15 to 20 minutes before serving so it sets up a bit. Leftovers reheat nicely in the microwave the next day; if they seem dry, just stir in a spoonful of tomato soup or a dollop of sour cream before warming.
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