Slow-Cooker Cajun Butter Seafood Boil

This slow-cooker seafood boil brings together lobster tails, jumbo shrimp, and smoky Andouille sausage in a rich, garlicky Cajun butter sauce. The baby potatoes soak up all the spicy, buttery goodness as everything simmers low and slow.

With just a few minutes of prep, you can let the slow cooker do the work while you enjoy the aroma filling your kitchen. Serve it over rice or with crusty bread to soak up every last drop of the sauce.

This recipe is all about letting the slow cooker do the heavy lifting. You simply layer the seafood, sausage, and potatoes in the pot, pour over the seasoned butter, and walk away. Hours later, you're rewarded with tender lobster, perfectly cooked shrimp, and potatoes that have absorbed the bold Cajun flavors.

The sauce is glossy and rich, with a gentle heat that builds as you eat. Serve it over steamed rice to catch every bit of the buttery sauce. It's a dish that looks impressive but requires almost no effort—exactly what busy home cooks need.

Ingredients

Why this recipe works

The slow cooker provides a gentle, even heat that keeps the seafood moist and tender without overcooking. Unlike high-heat methods, this low-and-slow approach allows the lobster and shrimp to cook through while remaining succulent.

The butter sauce acts as a cooking medium, bathing the ingredients in flavor and preventing them from drying out. This method also allows the potatoes to cook slowly, absorbing the Cajun spices and becoming creamy inside.

The key to this recipe is layering: the seafood goes in first, then the sausage and potatoes are scattered on top. This ensures that the lobster and shrimp sit in the butter sauce, while the potatoes and sausage cook in the flavorful liquid.

The result is a cohesive dish where every component is infused with the same garlicky, smoky, buttery goodness. The slow cooker also makes cleanup a breeze—just one pot to wash.

Notes and substitutions

For the best results, use raw, shell-on lobster tails and split them yourself, or ask your fishmonger to do it. The shell adds flavor and protects the meat during cooking. Jumbo shrimp (16/20 count) are ideal because they hold up well to the long cook time and remain juicy. If you use smaller shrimp, reduce the cooking time to avoid overcooking.

Andouille sausage is a smoked, spicy sausage that adds a deep, smoky flavor to the dish. If you can't find it, use any smoked sausage, like kielbasa, and add extra Cajun seasoning to taste. The baby potatoes are essential—they soak up the buttery sauce and become incredibly tender. Choose small, waxy potatoes like red or Yukon Gold for the best texture.

• lobster tails: Use extra large shrimp or crab legs for a more budget-friendly option; adjust cooking time accordingly.
• Andouille sausage: Smoked sausage or kielbasa works well if Andouille is unavailable; add extra Cajun seasoning to taste.
• baby potatoes: Use Yukon Gold or red potatoes cut into 1-inch chunks; adjust cooking time as needed.
• Cajun garlic-paprika butter: Combine 1/2 cup melted butter with 2 tsp Cajun seasoning, 1 tsp garlic powder, and 1 tsp smoked paprika.

Equipment

• 6-quart slow cooker
• Slotted spoon
• Cutting board
• Chef's knife
• Measuring cups and spoons
• Small bowl for lemon juice
• Serving platter