Slow Cooker Cajun Seafood Boil with Andouille

This slow cooker Cajun seafood boil brings together sea scallops, jumbo shrimp, smoky andouille sausage, and baby potatoes in a rich, spicy garlic-butter sauce. The beauty of this recipe is its simplicity: everything goes into the crockpot, the sauce is poured over, and the slow cooker does the rest.

In a few hours, you have a restaurant-quality meal that tastes like a Louisiana bayou feast. It’s perfect for busy weeknights or casual gatherings, and the hands-off method means you can set it and forget it.

This dish captures the spirit of a classic seafood boil but simplifies it for the slow cooker. The combination of tender scallops, sweet shrimp, and smoky andouille sausage creates a savory depth, while baby potatoes soak up the spicy butter sauce.

The sauce, made with melted butter, garlic, smoked paprika, cayenne, and fresh lemon juice, coats every bite with bright, piquant flavor. Because the slow cooker gently simmers everything together, the seafood stays moist and the potatoes become perfectly tender without any fuss. Serve it over steamed rice to soak up every last drop of the delicious sauce.

Ingredients

Why this recipe works

The slow cooker method is ideal for this dish because it allows the flavors to meld slowly and gently. The butter sauce infuses the seafood and potatoes as they cook, creating a cohesive, deeply seasoned result. Unlike boiling or searing, the slow cooker keeps the seafood from overcooking, ensuring the scallops and shrimp remain tender and juicy. The low, steady heat also breaks down the starches in the potatoes, giving them a creamy texture that soaks up the sauce beautifully.

Cooking everything in one pot means minimal cleanup and maximum convenience. The layering of ingredients—seafood on the bottom, sausage and potatoes on top—ensures even cooking and allows the heavier vegetables to weigh down the delicate seafood, keeping it submerged in the sauce.

The result is a dish that tastes like it took hours of hands-on attention, but actually requires just a few minutes of prep. This is the kind of meal that makes slow cooking worth it: set it in the morning, and come home to a fragrant, satisfying dinner.

Notes and substitutions

For the best texture, use dry-pack sea scallops rather than wet-packed ones, which are treated with preservatives and can become watery. Jumbo shrimp (21-25 count per pound) work well because they hold up to the long cooking time without shrinking too much.

Smoked andouille sausage is essential for that authentic Cajun flavor; if unavailable, a good smoked kielbasa makes a fine substitute. Baby potatoes are ideal because they cook evenly and don't need peeling, but any waxy potato can be used.

The Cajun butter sauce is the heart of this dish. Adjust the cayenne to suit your heat preference—start with a half teaspoon for a moderate kick, or increase to a full teaspoon for more fire. Fresh lemon juice brightens the richness of the butter and balances the spice. This recipe requires a 6-quart slow cooker; if using a smaller one, reduce the quantities proportionally. For a thicker sauce, you can stir in a slurry of cornstarch and water after cooking, but the dish is delicious as is.

• sea scallops: halibut or cod fillets, cut into chunks
• shrimp: lump crabmeat or crawfish tails
• andouille sausage: smoked kielbasa or chorizo
• baby potatoes: new potatoes or Yukon Gold, cut into 1-inch pieces

Equipment

• 6-quart slow cooker
• small saucepan
• slotted spoon
• measuring cups and spoons
• chef's knife
• cutting board