Rich, creamy, and unapologetically indulgent, Cheesy Jumbo Lump Crab Au Gratin is the kind of dish that instantly elevates your dinner table. With generous chunks of sweet crabmeat swirled into a velvety cheese sauce and baked until bubbling and golden, it’s both comfort food and luxury in one bite. Whether served as a decadent appetizer with toasted baguette slices or the star of a seafood dinner, this dish always impresses.

What makes this crab au gratin truly special is the blend of cheeses, from sharp cheddar to silky cream cheese, that wrap the crab in a dreamy, molten blanket. Fresh herbs and a touch of Old Bay add just the right flavor lift, balancing the richness with bright, savory notes.

What Kind of Crab Should I Use?

For the best flavor and texture, go with jumbo lump crabmeat. It’s sweet, firm, and holds its shape beautifully in this dish. Avoid imitation crab or overly shredded varieties. If you’re near the coast, fresh is best, but high-quality canned or refrigerated crab from the seafood section also works wonderfully.

Ingredients for the Cheesy Jumbo Lump Crab Au Gratin

1 lb jumbo lump crabmeat, picked over for shells
1 tbsp unsalted butter
1 small shallot, finely diced
2 cloves garlic, minced
1 tbsp all-purpose flour
1/2 cup whole milk
1/2 cup heavy cream
4 oz cream cheese, softened
1/2 cup shredded sharp cheddar cheese
1/4 cup grated Parmesan cheese
1 tsp Old Bay seasoning
1/2 tsp Dijon mustard
1 tbsp fresh parsley, chopped
Salt and pepper to taste
Extra cheese for topping (cheddar or a mix), optional
Toasted baguette slices or crackers, for serving

How To Make the Cheesy Jumbo Lump Crab Au Gratin

Step 1: Saute the Aromatics

In a medium saucepan over medium heat, melt the butter. Add the shallot and cook until soft, about 2 minutes. Stir in the garlic and cook for another 30 seconds.

Step 2: Build the Cheese Sauce

Sprinkle the flour over the aromatics and stir to combine, cooking for 1 minute. Slowly whisk in the milk and cream. Let it simmer for 2-3 minutes until slightly thickened. Reduce heat to low, then whisk in the cream cheese, cheddar, Parmesan, Old Bay, and Dijon until smooth and melted.

Step 3: Fold in the Crab

Gently fold in the crabmeat and parsley. Taste and adjust seasoning with salt and pepper. Transfer the mixture into a small baking dish or individual ramekins.

Step 4: Bake to Golden Perfection

Top with a little extra cheese if desired. Bake at 375°F for 15-18 minutes until bubbling and golden on top. Broil for 1-2 minutes at the end for a crustier top.

How to Serve and Store Cheesy Jumbo Lump Crab Au Gratin

This dish is best served warm straight from the oven with toasted baguette slices, crackers, or even over buttered pasta or rice. It makes a luxurious appetizer or seafood side dish at any gathering.

If you have leftovers, store them in an airtight container in the fridge for up to 2 days. Reheat gently in the oven or microwave, adding a splash of cream if the mixture seems too thick.

Frequently Asked Questions

Can I make this ahead of time?

Yes, assemble the dish up to the baking step, cover, and refrigerate. When ready to serve, bake as directed, adding 5 extra minutes to account for the chill.

What cheeses work best?

Sharp cheddar is key for flavor, cream cheese gives richness, and Parmesan adds a salty depth. You can mix in Gruyère or mozzarella for variation.

Can I freeze it?

It’s not recommended as the dairy can separate upon thawing. For best texture, enjoy it fresh.

What if I can’t find jumbo lump crab?

Backfin or lump crab is a good substitute. Just avoid flaky or stringy varieties that don’t hold shape well.

Is this spicy?

It’s mildly spiced from Old Bay. Add a dash of cayenne or hot sauce if you like more heat.

Want More Seafood Comfort Recipes?

If you’re into rich and savory dishes like this one, here are some other recipes you’ll love:

📌 Save this recipe to your Pinterest seafood board so it’s always within reach when a craving hits: Nina Dishes on Pinterest

I’d love to hear how your crab au gratin turned out! Did you go all cheddar or mix in something extra? Got a tip for reheating? Drop it in the comments. Let’s inspire each other with great kitchen ideas.

Cheesy Jumbo Lump Crab Au Gratin

Author: Nina Klatten
Total Time: 30 minutes
Yield: 4 servings

Print Recipe

Description

Cheesy Jumbo Lump Crab Au Gratin is a luxurious, creamy seafood dish made with sweet jumbo crab, a rich blend of cheeses, and savory spices. Baked to bubbly perfection, it’s perfect as an appetizer or decadent dinner centerpiece.

Instructions

1. In a medium saucepan over medium heat, melt the butter. Add the shallot and cook until soft, about 2 minutes. Stir in the garlic and cook for another 30 seconds.

2. Sprinkle the flour over the aromatics and stir to combine, cooking for 1 minute. Slowly whisk in the milk and cream. Simmer for 2-3 minutes until slightly thickened.

3. Reduce heat to low, then whisk in the cream cheese, cheddar, Parmesan, Old Bay, and Dijon until smooth and melted.

4. Gently fold in the crabmeat and parsley. Taste and season with salt and pepper. Transfer to a baking dish or ramekins.

5. Top with extra cheese if desired. Bake at 375°F for 15-18 minutes until bubbling and golden. Broil 1-2 minutes for a crisp top.