Cheesy Beef and Cauliflower Mash Thanksgiving Casserole — 30g Protein

This cheesy beef and cauliflower mash thanksgiving casserole is the Thanksgiving side that eats like a main. Seasoned ground beef simmers with tomatoes and herbs, then gets buried under a fluffy cauliflower mash folded with sharp cheddar — baked until the top is golden and bubbling. 30g of protein per serving, dinner in 50 minutes, and nobody misses the potatoes.

The cauliflower mash is the trick. Steamed cauliflower blends silky with a little butter and cream cheese, and the cheddar on top goes crisp at the edges in the oven. Make the beef layer ahead if you like — the whole dish assembles in minutes and bakes while you set the table.

Why you’ll love it

• 30g protein per serving, about 430 calories
• All the comfort of a shepherd’s pie, with cauliflower instead of potato
• Golden, bubbling cheddar top straight from the oven
• Serves 4 and reheats beautifully the next day

Ingredients

• 450g (about 1 lb) lean ground beef (90% lean)
• 1 medium cauliflower (about 700g), cut into florets
• 1 tbsp olive oil
• 1 medium onion, diced
• 2 garlic cloves, minced
• 1 can (400g) diced tomatoes, drained
• 1 tbsp tomato paste
• 1 tsp dried thyme
• 1 tsp smoked paprika
• 1 tsp coarse sea salt
• 1/2 tsp black pepper, freshly ground
• 2 tbsp unsalted butter
• 60g (2 oz) cream cheese
• 120g (about 1 1/4 cups) sharp cheddar cheese, grated
• 2 tbsp fresh parsley, chopped, to serve

Equipment used

• A large skillet, for browning the beef
• A medium saucepan or steamer, for the cauliflower
• A potato masher or hand blender, for the cauliflower mash
• A 20 x 20 cm baking dish, for assembling and baking the casserole

Instructions

1. Heat the oven to 200°C (400°F). Steam or boil the cauliflower florets for 10–12 minutes until very tender, then drain well.
2. Meanwhile, heat the olive oil in a large skillet over medium-high heat. Brown the ground beef for 6–7 minutes, breaking it up, then drain off any excess fat.
3. Add the onion and garlic and cook for 4–5 minutes until softened. Stir in the diced tomatoes, tomato paste, thyme, smoked paprika, salt and pepper and simmer for 5 minutes until thickened.
4. Mash the drained cauliflower with the butter and cream cheese until smooth, then fold in half the grated cheddar.
5. Spoon the beef mixture into the baking dish, spread the cauliflower mash over the top, and sprinkle with the remaining cheddar.
6. Bake for 20–25 minutes until the top is golden and the edges are bubbling. Rest for 5 minutes, sprinkle with parsley, and serve.

Tips

• Drain the cauliflower really well — wet cauliflower makes a watery mash. Let it sit in the colander for a couple of minutes and shake it dry.
• Season the mash. Cauliflower is mild, so taste it before assembling and add salt until it tastes good on its own.
• Use sharp cheddar, not mild — you get more flavour from less cheese, and the top browns better.
• The casserole keeps 3 days in the fridge. Reheat covered in a moderate oven until hot through, then uncover for a few minutes to re-crisp the top.

Estimated nutrition per serving

These are estimated macros based on standard ingredient values, not lab-measured results.

More high-protein recipes to try

• Healthy Ground Beef Shepherd’s Pie with Mashed Cauliflower
• Lean Ground Beef Thanksgiving Stuffing Skillet
• Lean Beef Cottage Pie Casserole Fall Comfort Food

FAQ

Can I make it ahead? Yes. Assemble the casserole up to a day ahead, cover and refrigerate, then bake for 25–30 minutes (a little longer than usual, since it starts cold) until golden and bubbling.

Is this cheesy beef and cauliflower mash thanksgiving casserole low carb? It is much lower in carbs than a potato-topped pie — about 14g per serving — because the cauliflower mash replaces the potato. It is not keto-strict, thanks to the tomatoes and onion, but it fits a low-carb table well.

Can I freeze it? Yes. Bake it, cool it completely, then freeze in portions for up to 2 months. Thaw overnight in the fridge and reheat in the oven until hot through.

What cheese works best? Sharp cheddar gives the most flavour and the best golden top. A cheddar and Gruyère mix is lovely too, if you have it.

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