This keto pesto beef bake is herby, cheesy, and a nice change from the usual low-carb casseroles. Basil pesto brings a big punch of flavor with barely any carbs, and a creamy layer of ricotta and melted mozzarella ties it all together.

You only need six ingredients, one skillet, and a baking dish. The recipe serves four and takes under an hour from start to finish, with most of that time in the oven. It is filling, family friendly, and great for meal prep.

Why This Pesto Beef Bake Works

Ground beef and pesto might sound like an odd pair, but they work really well together. The basil, garlic, Parmesan, and olive oil in pesto act like a ready-made sauce and seasoning in one jar. As the beef cooks, it soaks up all that herby flavor.

Spinach or kale adds color and some vegetables without adding many carbs. Stirring in ricotta or cream cheese turns the skillet mixture creamy and rich, almost like the filling of a lasagna. A thick blanket of mozzarella on top bakes into a golden, bubbly crust.

Because the beef is fully cooked before it goes into the oven, the bake time is mostly about melting the cheese and blending the flavors. That makes this recipe very forgiving.

It is also a smart way to get greens onto the table. The spinach melts into the creamy filling, so picky eaters mostly notice the cheese and the pesto. If your family loves lasagna, this bake hits many of the same notes in far less time.

Ingredients and Easy Swaps

• Ground beef: One and a half pounds. Ground turkey, chicken, or Italian sausage also work well.
• Basil pesto: Half a cup of a no-sugar-added pesto. Check the label, since some brands add sugar or fillers. Homemade pesto is great too.
• Spinach or kale: Two cups, chopped. Fresh or frozen both work. Squeeze frozen greens very dry after thawing.
• Ricotta or cream cheese: Three quarters of a cup. Ricotta is lighter and fluffier. Cream cheese is richer and creamier.
• Mozzarella: Two cups, shredded. Provolone or an Italian blend are good swaps.
• Salt and pepper: Season after adding the pesto, since pesto is already salty.

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 any extra fat.
3. Stir in the pesto and spinach. Cook for 2 to 3 minutes until the greens wilt.
4. Lower the heat and mix in the ricotta or cream cheese until creamy. Season with salt and pepper.
5. Spread the mixture in the baking dish and top with mozzarella.
6. Bake for 25 to 30 minutes, until hot and bubbly.

Common Mistakes to Avoid

Not draining the beef. Pesto already has plenty of oil. If you leave the beef fat in the pan, the bake turns greasy. Drain it well before adding the pesto.

Using wet frozen spinach. Thawed frozen spinach holds a lot of water. Squeeze it in a clean towel until it is dry, or the casserole gets watery.

Adding too much salt. Pesto and cheese bring a lot of salt. Taste first, then season.

Cooking the cheese mixture on high. Ricotta and cream cheese can separate over high heat. Lower the heat before stirring them in.

Variations

• Sun-dried tomato: Stir in a quarter cup of chopped sun-dried tomatoes with the spinach.
• Mushroom: Sauté sliced mushrooms with the beef for more texture and flavor.
• Chicken pesto bake: Use shredded rotisserie chicken in place of ground beef.
• Spicy: Add a pinch of red pepper flakes or use hot Italian sausage.
• Not keto: Stir in cooked penne for a pesto pasta bake.

What to Serve With It

• A simple arugula salad with lemon and olive oil
• Roasted broccoli, asparagus, or green beans
• Zucchini noodles tossed with a little butter
• Cauliflower mash
• Low-carb garlic bread or cheese crisps

For anyone not eating low-carb, serve it over pasta or with crusty bread.

Make Ahead, Storage, and Reheating

Make ahead: Assemble the bake up to one day ahead, cover it, and refrigerate. Add about 10 minutes to the bake time since it goes into the oven cold.

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

Reheating: Warm single servings in the microwave for 1 to 2 minutes, or reheat the whole dish covered at 350°F for 15 to 20 minutes.

Freezing: Freeze cooled portions for up to three months. Thaw overnight in the fridge before reheating. Cream cheese versions freeze a little better than ricotta.

Frequently Asked Questions

Is store-bought pesto keto?
Most basil pesto is low in carbs, but some brands add sugar, potato flakes, or cashews. Choose one with 2 grams of carbs or less per serving.

Can I use a smaller baking dish?
Yes. An 8×8 or 9×9 dish gives a thicker layer. Bake it a few minutes longer so it heats all the way through.

Can I make my own pesto?
Yes. Blend fresh basil, garlic, Parmesan, pine nuts or walnuts, and olive oil until smooth. Use half a cup in this recipe.

Can I use a different pesto?
Yes. Sun-dried tomato pesto or a basil and arugula pesto both work. Check the carb count if you are keeping it keto.

Which is better, ricotta or cream cheese?
Both work. Ricotta gives a lighter, lasagna-like texture, while cream cheese makes it extra creamy. Use whichever you have on hand.