Cajun Crab Pasta Dish is what happens when a Louisiana seafood boil meets a creamy pasta night: smoky andouille, sweet lump crab, trinity vegetables, and penne tossed in a velvety cream sauce with just enough cayenne to make your lips tingle. It's the kind of dinner that looks like a restaurant plate but comes together in one skillet on a Tuesday.
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The secret is layering the Cajun seasoning in stages instead of dumping it all in at once. Blooming the spices in the sausage fat wakes up the paprika and cayenne, then a second hit at the end keeps the flavor bright and forward instead of flat. The crab goes in last, off the heat, so it stays in plump, sweet lumps instead of shredding into the sauce.
Serve it with crusty bread, cold beer, or a crisp Sauvignon Blanc. It reheats beautifully the next day, though the crab is at its absolute best the night you make it.
Why You'll Love This Recipe
About the Ingredients
12 oz (340g) penne rigate or cavatappi
Ridged shapes trap the cream sauce far better than smooth ones. If you're gluten-free, a chickpea or brown rice penne works, but cook it 1 minute shy of the package time so it doesn't turn mushy.
8 oz (225g) andouille sausage, sliced into half-moons
Andouille gives the smoky backbone of the whole dish. If you can't find it, use smoked kielbasa plus 1/4 teaspoon extra cayenne, or diced tasso ham for a more Louisiana-style result.
3 tablespoons unsalted butter
Butter carries the Cajun spices and gives the sauce its glossy finish. Salted butter works too, just cut the added salt in the recipe by half.
1 medium yellow onion, diced (about 1 cup)
This is the first third of the Cajun holy trinity. Sweet onion is fine, but yellow has more punch once it caramelizes in the sausage fat.
1 green bell pepper, diced (about 1 cup)
Green bell is traditional and slightly bitter in a good way. Red or orange bell will taste sweeter and a little less authentic.
2 celery ribs, diced (about 3/4 cup)
Celery completes the trinity and adds a clean herbal note. Look for ribs that snap when you bend them; limp celery tastes watery.
4 cloves garlic, minced
Fresh garlic only here, please. Jarred garlic is sweeter and flatter and will disappear under the Cajun spice.
2 tablespoons Cajun seasoning (plus more to taste)
Store-bought blends vary wildly in salt. If yours is salt-heavy, use 1 1/2 tablespoons and taste before adding more. Make your own with paprika, cayenne, garlic powder, onion powder, oregano, and thyme.
1 1/2 cups (355ml) heavy cream
Heavy cream is what makes the sauce cling to the pasta. Half-and-half will work but simmer it gently, and add 1 teaspoon cornstarch slurry to prevent a thin sauce.
1 cup (240ml) low-sodium chicken broth
Broth loosens the cream so it coats instead of clumps. Seafood or vegetable broth is a great swap if you want a stronger ocean flavor.
1 lb (450g) jumbo lump crabmeat, picked over
Jumbo lump is the splurge worth making; claw meat is a budget-friendly swap with a slightly stronger flavor. Buy pasteurized refrigerated crab over canned when you can, and always pick it over for shell fragments.
1/2 cup (50g) grated Parmesan, plus more for serving
Parmesan adds salty umami that ties the cream and seafood together. Pecorino Romano is sharper; use a little less.
Tips & Tricks
Don't boil the crab
Fold the crabmeat in after the pan is off the heat. Boiling it for even two minutes turns those sweet lumps into rubbery shreds.
Salt the pasta water properly
Use about 1 tablespoon of kosher salt per gallon of water. This is your only chance to season the pasta itself from the inside.
Taste the Cajun blend first
Brands range from mild to fiery. Start with 1 1/2 tablespoons, taste the sauce, then add the rest so you don't blow out the dish.
Reserve the pasta water
A splash of starchy pasta water emulsifies the cream sauce if it looks broken or greasy. Add it 1 tablespoon at a time.
Pro Tips
Step-by-Step Instructions
1. Boil the pasta
Bring a large pot of heavily salted water to a rolling boil, add the penne, and cook 1 minute shy of the package directions, about 9 minutes for al dente. Reserve 1 cup of pasta water, then drain.
2. Brown the sausage
Heat a large deep skillet or Dutch oven over medium-high heat (375F / 190C). Add the sliced andouille and cook 5 to 6 minutes, stirring occasionally, until deeply browned at the edges and the fat has rendered out. Transfer the sausage to a plate with a slotted spoon.
3. Sweat the trinity
Reduce heat to medium (325F / 165C). Add the butter, onion, bell pepper, and celery to the sausage fat and cook 6 to 7 minutes, stirring, until the onions are translucent and the peppers are soft, with no browning.
4. Bloom the spices
Stir in the garlic and Cajun seasoning and cook 45 seconds, until the spices smell toasted and fragrant and darken slightly against the vegetables. Do not walk away; garlic burns in under a minute.
5. Build the sauce
Pour in the chicken broth and scrape up any browned bits from the bottom of the pan. Simmer 3 to 4 minutes at a gentle bubble (about 200F / 93C) until reduced by half.
6. Add cream and cheese
Lower the heat to medium-low (300F / 150C), stream in the heavy cream, and stir in the Parmesan. Simmer 4 to 5 minutes, until the sauce coats the back of a spoon and small bubbles ring the edge of the pan.
7. Toss pasta and sausage
Add the drained penne and reserved sausage to the skillet and toss 2 minutes over low heat until every piece is glossy and coated. If the sauce tightens, loosen it with pasta water 1 tablespoon at a time.
8. Fold in the crab
Remove the pan from the heat entirely and gently fold in the crabmeat with a rubber spatula, just until it's distributed and warmed through, about 1 minute. Taste and adjust salt and Cajun seasoning.
9. Serve hot
Divide among warm bowls, shower with extra Parmesan, and finish with sliced scallions, lemon wedges, and hot sauce on the side.
Delicious Variations
Smoky Cajun Crab Alfredo
Swap the chicken broth for white wine and add 1/4 cup cream cheese for a thicker, richer sauce.
Cajun Crab Linguine with Shrimp
Replace half the crab with 8 ounces of peeled shrimp added in the last 3 minutes of cooking.
Dairy-Free Cajun Crab Pasta
Use full-fat coconut milk in place of the cream and skip the Parmesan; add 1 extra tablespoon of Cajun seasoning to compensate.
How to Store Cajun Crab Pasta Dish
Refrigerator
Store in an airtight container in the refrigerator for up to 3 days. The crab will lose some texture each day, so it's best within 48 hours.
Freezer
Freezing is not recommended; the cream sauce separates and the crab turns watery. If you must, freeze the sauce without the crab for up to 2 months.
Reheating
Reheat gently in a skillet over low heat with a splash of broth or cream, stirring until just hot. Never microwave crab pasta on high or the crab turns rubbery.
Frequently Asked Questions
Q: Can I use canned crab meat for Cajun crab pasta?
Yes, canned crab works in a pinch, but drain it well and add it at the very end so it doesn't break apart. Pasteurized refrigerated jumbo lump crab gives you much bigger, sweeter chunks and is worth the extra cost for this dish.
Q: How do I keep the cream sauce from curdling?
Keep the heat at medium-low and add the cream slowly while stirring. Cold cream hitting a screaming-hot pan is the number one cause of curdling, so let it sit out for 10 minutes before you pour it in.
Q: Is Cajun crab pasta very spicy?
It's moderately spicy as written, roughly a medium-hot level, because the cream and Parmesan soften the cayenne. For a milder version, use 1 tablespoon of Cajun seasoning and serve hot sauce on the side so heat lovers can add their own.
Q: What pasta shape is best for Cajun crab pasta?
Ridged, tubular shapes like penne rigate or cavatappi are best because the sauce clings to the ridges and fills the tubes. Linguine or fettuccine also work well if you prefer long noodles.
Q: Can I make this Cajun crab pasta ahead of time?
You can prep the trinity, slice the sausage, and grate the cheese up to a day ahead, but cook the pasta and sauce fresh. Assembled pasta sits heavy and the crab gets rubbery when reheated, so this is a same-day dish.
Grab a deep skillet and a pound of lump crab this week and make this Cajun Crab Pasta Dish for someone you like. If you cook it, leave a comment telling me how spicy you went, and snap a photo for Instagram so I can see your bowl.
Cajun Crab Pasta Dish
Cajun Crab Pasta Dish is a creamy, spicy one-pan dinner with lump crab, smoky andouille, and penne ready in 30 minutes.
🧂 Ingredients
- 12 oz (340g) penne rigate or cavatappi
- 8 oz (225g) andouille sausage, sliced into half-moons
- 3 tablespoons unsalted butter
- 1 medium yellow onion, diced (about 1 cup)
- 1 green bell pepper, diced (about 1 cup)
- 2 celery ribs, diced (about 3/4 cup)
- 4 cloves garlic, minced
- 2 tablespoons Cajun seasoning (plus more to taste)
- 1 1/2 cups (355ml) heavy cream
- 1 cup (240ml) low-sodium chicken broth
- 1 lb (450g) jumbo lump crabmeat, picked over
- 1/2 cup (50g) grated Parmesan, plus more for serving
📋 Instructions
- 1Boil the pasta — Bring a large pot of heavily salted water to a rolling boil, add the penne, and cook 1 minute shy of the package directions, about 9 minutes for al dente. Reserve 1 cup of pasta water, then drain.
- 2Brown the sausage — Heat a large deep skillet or Dutch oven over medium-high heat (375F / 190C). Add the sliced andouille and cook 5 to 6 minutes, stirring occasionally, until deeply browned at the edges and the fat has rendered out. Transfer the sausage to a plate with a slotted spoon.
- 3Sweat the trinity — Reduce heat to medium (325F / 165C). Add the butter, onion, bell pepper, and celery to the sausage fat and cook 6 to 7 minutes, stirring, until the onions are translucent and the peppers are soft, with no browning.
- 4Bloom the spices — Stir in the garlic and Cajun seasoning and cook 45 seconds, until the spices smell toasted and fragrant and darken slightly against the vegetables. Do not walk away; garlic burns in under a minute.
- 5Build the sauce — Pour in the chicken broth and scrape up any browned bits from the bottom of the pan. Simmer 3 to 4 minutes at a gentle bubble (about 200F / 93C) until reduced by half.
- 6Add cream and cheese — Lower the heat to medium-low (300F / 150C), stream in the heavy cream, and stir in the Parmesan. Simmer 4 to 5 minutes, until the sauce coats the back of a spoon and small bubbles ring the edge of the pan.
- 7Toss pasta and sausage — Add the drained penne and reserved sausage to the skillet and toss 2 minutes over low heat until every piece is glossy and coated. If the sauce tightens, loosen it with pasta water 1 tablespoon at a time.
- 8Fold in the crab — Remove the pan from the heat entirely and gently fold in the crabmeat with a rubber spatula, just until it's distributed and warmed through, about 1 minute. Taste and adjust salt and Cajun seasoning.
- 9Serve hot — Divide among warm bowls, shower with extra Parmesan, and finish with sliced scallions, lemon wedges, and hot sauce on the side.
