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Keto Crab Mac and Cheese {Extra Creamy!}

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Keto Crab cauliflower Mac n cheese is a great keto dinner casserole, whipped up easily for your next delicious meal.

cheesy crab bake
cheesy crab mac

Step 1: Roast Cauliflower

To begin, you’ll roast your chopped cauliflower florets and place them on a non-stick baking sheet or parchment paper.

Next, roast them at 400°F for about 10 minutes or until you see them start to get a little golden.

add roasted cauliflower to baking dish
roasted cauliflower florets

How many carbs are in cauliflower?

One cup of cauliflower has only 5g. carbs.

canned crab meat
canned crab is easy and effortless

Does canned crab have carbs?

Canned crab may have 1-2 g. carbs, but fresh crab has 0 carbs.

Be careful to not use imitation crab, as it can contain up to 13 g. carbs per serving.

How many carbs are in mac and cheese?

There are typically 44g. of carbs in a regular serving of mac and cheese.

This recipe is inspired by one of my favorite seafood mac and cheese recipe, but way lower in carbs.

creamy keto crab casserole with cheese
mix it up and add cheese sauce

Step 2: Add other ingredients for a cheesy crab mac bake

First, roast the cauliflower.

Meanwhile, melt butter and cream cheese over medium heat in a large pot.

Add in some dijon mustard, then shredded cheeses.

Next, mix and add crab and Old Bay seasoning, your favorite seafood or cajun seasonings.

Step 3: Pour cheesy goodness over roasted cauliflower & bake

Finally, add this mixture to your roasted cauliflower and bake.

keto cheese sauce for cauliflower mac
Did I mention cheese?!

What cheese should I use?

I used a blend of cheddar and Italian shredded cheese.

You may also use parmesan cheese, as it pairs well with crab.

Love creamy crab recipes? Also try this easy crab soup recipe.

casserole with cheddar crab cauliflower keto
Baked to perfection

Sides for crab mac

Grab a low-carb tortilla, cut into triangles and fry and a teaspoon of olive oil to make your own low carb tortilla chips for dipping into the casserole. 

Toast and butter low carb bread as a side to this casserole or serve with parmesan-crusted zucchini chips.

Or, try a nice green veggie or side salad for this rich and creamy keto seafood mac and cheese.

keto low carb cauliflower mac and cheese casserole
Dig in!

How long will this keep in the fridge?

I recommend eating this recipe by the third day, when everything is most fresh.

crab mac n cheese casserole
creamy crab mac and cheese casserole

Can I freeze keto crab mac and cheese casserole?

I do not recommend freezing cauliflower once cooked with cream cheese. 

cauliflower florets with creamy crab mac cheese
Makes a creamy appetizer!

What can I use if I don’t have cauliflower?

Mushroom lover? Sauté mushrooms and add other ingredients for a cheesy mushroom-crab casserole.

If you have low-carb tortillas lying around, make a crab mix with cheese for a low-carb crab quesadilla. 

cauliflower crab mac and cheese

Keto Crab Mac and Cheese

The perfect seafood cauliflower mac and cheese. A creamy, rich low-carb and keto friendly dinner!
4.65 from 14 votes
Print Pin Rate
Course: Casserole, Dinner
Cuisine: American
Prep Time: 5 minutes
Cook Time: 30 minutes
Total Time: 35 minutes
Servings: 8
Calories: 163kcal
Author: Amber @ Low Carb Quick


  • 1 cauliflower head chopped into florets
  • 1 tbsp butter
  • 2 oz cream cheese
  • ¾ cup heavy whipping cream
  • 1 tsp dijon mustard
  • ¾ cup shredded cheddar cheese
  • cups shredded Italian cheese blend or mozzarella
  • 2 cans crab meat drained of juice
  • 1 tbsp Old Bay Seasoning or favorite seafood seasoning


  • Roast cauliflower on a non-stick baking sheet at 400°F for about 10 minutes.
    add roasted cauliflower to baking dish
  • Meanwhile, melt butter and cream cheese over medium heat in a large pot.
    Melting cream cheese and butter
  • Add heavy cream.
    adding cream
  • Add dijon mustard.
    adding dijon mustard
  • Add shredded cheeses.
    add cheddar and Italian cheeses
  • Add crab. Stir.
    add canned crab and stir
  • Pour mixture over cauliflower.
    add creamy cheesy crab sauce
  • Top with extra shredded cheese and bake at 400° for 20-25 minutes.
    cauliflower crab mac and cheese


Calories: 163kcal | Carbohydrates: 5g | Protein: 9g | Fat: 12g | Saturated Fat: 7g | Trans Fat: 1g | Cholesterol: 40mg | Sodium: 262mg | Potassium: 256mg | Fiber: 2g | Sugar: 2g | Vitamin A: 401IU | Vitamin C: 35mg | Calcium: 211mg | Iron: 1mg

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