Transfer the mixture to the prepared baking dish or spread it out evenly in your oven-safe skillet. Press it down gently so there are no big air pockets.
Sprinkle the remaining 1 cup of shredded cheddar cheese evenly over the top to create a good, solid layer that will melt and brown in the oven.
Cover the dish tightly with foil and bake for 20 minutes to help the cauliflower steam and soften. Then remove the foil and continue baking for another 15–20 minutes, or until the cauliflower is tender when pierced with a fork and the top is bubbly and starting to brown around the edges.
For a deeper browned, slightly crispy cheese topping like in the photo, switch the oven to broil for 2–3 minutes at the end, watching closely so the cheese doesn’t burn.
Let the skillet casserole rest for about 5–10 minutes before serving. This short rest helps the juices settle so each scoop is nicely saucy but not runny. Serve warm, scooping down through the browned cheese to get a mix of beef and cauliflower in every portion.
If you have picky eaters, chop the cauliflower into smaller pieces so it blends in more with the ground beef, or use a mix of small florets and riced cauliflower. You can swap cream of mushroom soup for cream of chicken or cream of celery if that’s what you have on hand. For a different flavor, use a blend of cheddar and mozzarella or Monterey Jack cheese. To stretch the dish even further for a crowd (while still keeping it relatively low carb), you can add another cup or two of cauliflower or stir in a handful of sliced mushrooms before baking. If you’d like a little kick, sprinkle a pinch of crushed red pepper or smoked paprika into the beef mixture. For those who are gluten-free, choose a condensed soup labeled gluten-free, as many regular condensed soups contain wheat. Food safety tips: Always cook ground beef until it is no longer pink and reaches an internal temperature of 160°F (71°C). Drain excess grease carefully to avoid splatters and burns. Cool leftovers within 2 hours of baking, store them in a covered container in the refrigerator, and use within 3–4 days. Reheat leftovers until they are steaming hot all the way through before serving.
