Keto Taco Casserole

I make this keto taco casserole almost every week during busy stretches. The whole thing comes together in one skillet before a quick bake, and it feeds my family of four with leftovers. Seasoned ground beef, zucchini, cauliflower rice, Rotel, and a thick layer of melted Colby jack. No eggs, no filler, just taco flavor that actually tastes like taco night.

I tested egg-based versions early on because most casserole recipes call for a binder. The egg gave the whole dish this subtle breakfast quality that didn’t belong. Once I dropped it, the beef and veggie flavors came through clean, and the filling holds together fine on its own once you drain the liquid before baking. That decision changed everything about how this recipe eats.

The biggest lesson from making this dozens of times: control the moisture. Salt your diced zucchini for about 10 minutes, then squeeze it dry before it goes in the skillet. Use a slotted spoon to transfer the filling to the casserole dish so the cooking liquid stays behind. Reader Todd figured this out on his own with the cauliflower rice (squeeze it dry first) and got the same result. Those small steps keep the bottom from getting soggy.

If you’d rather skip the extra dish, an oven-safe skillet works fine for the bake. Just pour off the liquid before adding cheese. I do this on nights when I don’t want to wash anything extra, and the edges get slightly more caramelized in cast iron, which I actually prefer.

Don’t skip the sour cream sauce. Plain sour cream is fine, but the lime juice and a pinch of salt take this from good to great. I pipe it on with a plastic bag (cut the corner off) when I want it to look sharp, but a spoon drizzle works too.

The crushed tortilla chips on top give you the crunch from regular taco night. I make my own sometimes, but store-bought chips crushed in a bag work when I’m short on time. Pull the chips off before you store leftovers. They go soggy in the fridge. Add fresh ones when you reheat.

For more low carb weeknight dinners like this, try my sheet pan fajitas, zucchini taco boats, or keto hamburger helper. All of them take under 30 minutes and my family rotates through them without complaining.

Everything happens in one skillet, then you transfer to a baking dish (or keep it in the skillet if it’s oven-safe). The whole process takes about 30 minutes from start to table.

Key ingredients and substitutions

• Ground beef – I use 80/20 for this recipe. Ground turkey, chicken, or venison all work too.
• Onion – Yellow onion has the lowest net carbs, but white works fine.
• Oil – I use avocado oil. Light olive oil or ghee are good swaps.
• Rotel – One can of Rotel, or use a can of diced tomatoes plus a small can of green chilis. Fresh green chilis work too; add them at the same time as the zucchini so they soften.
• Zucchini – Medium, diced. Don’t peel it. The skin softens during cooking and adds extra fiber.
• Black olives – I like them, but skip these if they’re not your thing.
• Cauliflower rice – Fresh (pulse florets in a food processor), frozen from a bag, or pre-riced from the produce section. All work.
• Cheese – I go with Colby jack. Monterey jack, cheddar, or a Mexican blend are all good. Mix in some cream cheese if you want it creamier.
• Tortilla chips – Make your own or use store-bought like Quest Chips or Mr. Tortilla Chips.
• Green onions – Use both the white and green parts.
• Sour cream – Plain Greek yogurt works if you want to cut fat and calories.
• Seasoning – Chili powder, oregano, salt, and garlic. Store-bought taco seasoning is a fast substitute.