Aunt Linda always stretched a dollar with this hearty baked dinner. A warm comfort meal that tastes like an expensive diner treat but melts in your mouth for pennies.

This low carb 5-ingredient ground beef casserole is my take on the kind of budget-stretcher my Aunt Linda swore by. She could turn a single pound of meat into a cozy, diner-style baked dinner that fed a crowd and felt way fancier than it cost. This version keeps that same ‘melts in your mouth for pennies’ comfort, but skips the pasta and potatoes so it stays low carb. It’s the kind of weeknight recipe you can throw together after work with pantry basics, then pull out of the oven as a bubbly, cheesy dish that smells like an old-school diner classic.

Serve this casserole hot, scooped straight from the glass baking dish with a big spoon. It pairs really well with a simple green side salad, steamed broccoli, or roasted green beans to keep things low carb and colorful. If your family isn’t low carb, you can spoon it over buttered egg noodles, cauliflower rice, or regular rice to stretch it even further. A little sour cream and sliced green onions on top make it feel extra diner-style, and a dill pickle spear on the side is surprisingly perfect.

Servings: 4

1 pound ground beef (80–90% lean)

Preheat your oven to 375°F (190°C). Lightly grease a 2-quart glass baking dish with nonstick spray or a little oil so the casserole doesn’t stick.

In a large skillet over medium-high heat, crumble in the ground beef. Cook, stirring and breaking it up with a spoon, until it’s browned and no pink remains, about 7–9 minutes.

Drain off any excess grease from the skillet if needed. Return the beef to the heat and season with garlic powder, salt, and black pepper. Stir in the sugar-free marinara or tomato sauce until the beef is evenly coated and the mixture is saucy but thick.

Spread the saucy ground beef mixture evenly in the bottom of the greased glass baking dish, pressing it into an even layer. This creates that rich brown meat base you want for a diner-style casserole.

In a medium bowl, stir together the sour cream and 1 cup of the shredded cheddar cheese. This becomes your creamy, tangy topping that melts into the beef as it bakes.

Dollop the sour cream and cheese mixture over the beef layer, then gently spread it out to cover most of the surface. It doesn’t have to be perfect; a few gaps are fine and add texture.

Sprinkle the remaining 1 cup of shredded cheddar cheese evenly over the top, making sure you have good coverage so you get that bubbly, browned cheese crust.

Place the casserole in the preheated oven and bake for 18–22 minutes, or until the cheese is fully melted, bubbling around the edges, and lightly browned on top.

For extra browning, you can switch the oven to broil for 1–2 minutes at the end. Watch it closely so the cheese goes golden and spotty-brown but doesn’t burn.

Let the casserole rest for about 5–10 minutes before serving so it sets slightly and is easier to scoop. Serve warm straight from the glass baking dish, making sure each serving gets plenty of the gooey cheese topping and savory beef base.

To stretch the casserole even further while keeping it low carb, you can stir 1–2 cups of finely chopped veggies (like zucchini, mushrooms, or bell peppers) into the browned beef before adding the sauce; just sauté them until soft so they blend into the filling. For extra diner flavor, add 1 teaspoon of onion powder or dried minced onion along with the garlic powder. Swap the cheddar for a mix of mozzarella and provolone for a more ‘melt-in-your-mouth’ stringy cheese pull, or use pepper jack if your family likes a little kick. If you’re cooking ahead, assemble the casserole up to a day in advance, cover, and refrigerate; add 5–10 minutes to the bake time when cooking from cold. Leftovers reheat really well in the oven or microwave and can be spooned into low carb tortillas, over cauliflower rice, or into lettuce cups for quick next-day lunches.