This keto chili cheese casserole has everything you love about a bowl of chili, baked under a thick, bubbly layer of cheddar. Seasoned ground beef, tomatoes with green chiles, and warm chili spices come together in one skillet, then go into the oven until the cheese is golden.

There are no beans and no tortillas, so it stays low in carbs while still tasting like real comfort food. The recipe serves four, takes about 45 minutes, and uses ingredients you probably already have in the pantry. It is a great choice for game day, busy weeknights, or a cold evening when you want something warm and hearty.

Why This Casserole Works

Ground beef browns quickly and soaks up flavor, so it is a perfect base for a chili-style bake. Chili powder, cumin, and garlic powder give it that classic chili taste without a seasoning packet, which can have added sugar or starch.

Diced tomatoes with green chiles do double duty. They add moisture, a little tang, and a mild kick of heat, all from one can. Draining them first keeps the casserole thick instead of soupy.

Two cups of cheddar on top melt into a rich, cheesy crust. Because the beef is already cooked when it goes in the oven, the bake is mostly about melting the cheese and letting the flavors come together. That makes this recipe very hard to mess up.

Ingredients and Easy Swaps

• Ground beef: One and a half pounds. 80/20 or 85/15 gives the best flavor. Ground turkey or a mix of beef and pork sausage also work.
• Diced tomatoes with green chiles: Three quarters of a cup, drained. Use the mild or hot version to suit your family. Plain diced tomatoes plus a small can of green chiles also work.
• Chili powder: Two teaspoons give a medium chili flavor. Add more if you like it bold.
• Cumin: Half a teaspoon adds that warm, earthy chili taste.
• Garlic powder: A quarter teaspoon. You can use one minced fresh clove instead.
• Cheddar cheese: Two cups, shredded. Pepper Jack, Monterey Jack, or a Mexican blend are all good swaps.
• Salt and pepper: Season to taste after the tomatoes go in.

How to Make It at a Glance

1. Heat the oven to 375°F and grease a 9×13-inch baking dish.
2. Cook the ground beef in a large skillet until browned and it reaches 160°F. Drain off any extra fat.
3. Stir in the drained tomatoes, chili powder, cumin, garlic powder, salt, and pepper.
4. Spread the beef mixture evenly in the baking dish.
5. Top with the shredded cheddar.
6. Bake for 25 to 30 minutes, until hot and bubbly.

Common Mistakes to Avoid

Not draining the tomatoes. The extra liquid makes the casserole runny. Pour them into a strainer for a minute before adding them.

Leaving the fat in the pan. Ground beef releases a lot of fat. Spoon it out or drain it before adding the spices so the casserole is not greasy.

Undercooking the beef. Ground beef should reach 160°F with no pink left before it goes into the baking dish.

Skipping the taste test. Canned tomatoes and cheese vary in salt. Taste the beef mixture before you spread it in the dish and adjust the seasoning.

Serving it straight from the oven. Let it rest for 5 minutes so the cheese sets a little and each scoop holds together.

Variations

• Spicy: Add a diced jalapeño with the beef, use hot tomatoes with chiles, and top with pepper Jack.
• Bacon chili cheese: Stir in four slices of crumbled cooked bacon.
• Veggie boost: Sauté diced bell pepper and onion with the beef. They add a few carbs but lots of flavor.
• Cream cheese layer: Spread 4 ounces of softened cream cheese in the bottom of the dish before adding the beef for an extra creamy bite.
• Not keto: Add a can of drained kidney beans or serve it with tortilla chips for scooping.

What to Serve With It

Pile on your favorite chili toppings, like sour cream, sliced green onions, diced avocado, pickled jalapeños, or fresh cilantro. For sides, try:

• A crisp green salad with ranch or a lime vinaigrette
• Roasted cauliflower or broccoli
• Cauliflower rice with a squeeze of lime
• Low-carb tortillas or pork rinds for scooping
• Cornbread or tortilla chips for anyone not eating low-carb

Make Ahead, Storage, and Reheating

Make ahead: Cook the beef mixture, spread it in the dish, and top with cheese up to one day ahead. Cover and refrigerate. Add about 10 minutes to the bake time.

Storage: Keep leftovers in an airtight container in the fridge for up to four days.

Reheating: Microwave single servings for 1 to 2 minutes, or reheat the dish covered at 350°F for 15 to 20 minutes, until hot all the way through.

Freezing: Freeze cooled portions for up to three months. Thaw overnight in the fridge before reheating.

Frequently Asked Questions

Is this casserole really keto?
Yes. Ground beef, spices, and cheddar are very low in carbs. The tomatoes add a few, so it fits most keto and low-carb plans.

Is it spicy?
It has a mild to medium heat, depending on the tomatoes with green chiles you use. Choose the mild version for kids.

Can I use leftover chili?
Yes. Spread about 4 cups of thick, bean-free chili in the dish, top with cheese, and bake until bubbly.

What size dish should I use?
A 9×13-inch dish gives a thinner, cheesier layer. An 8×8 dish makes it thicker. Bake it a few minutes longer in a smaller dish.