Bring the flavor of a Southern seafood feast to your kitchen with this Slow Cooker Cajun Shrimp Boil! Juicy shrimp, tender baby potatoes, smoky sausage, and sweet corn are tossed in a buttery Cajun seasoning sauce with garlic, lemon, and a little spice. Everything cooks together in the slow cooker, making this a delicious, fuss-free dinner that’s perfect for busy weeknights, family gatherings, or a cozy weekend meal.
The best part? The shrimp are added near the end, so they stay tender and juicy instead of becoming rubbery.
Recipe Overview
- Prep Time: 15 minutes
- Cook Time: 4–5 hours on LOW or 2–3 hours on HIGH, plus shrimp cooking time
- Total Time: Approximately 4 hours 30 minutes
- Servings: 6
- Course: Main Course, Dinner
- Cuisine: Cajun-inspired American
- Cooking Method: Slow Cooker
Ingredients
For the Shrimp Boil
- 2 pounds large raw shrimp, peeled and deveined, tails on or off
- 1½ pounds baby red or Yukon Gold potatoes, halved
- 1 pound smoked andouille sausage, sliced into rounds
- 3 ears fresh corn, cut into thirds
- 1 medium yellow onion, cut into wedges
- 4 cloves garlic, minced
- 1 cup low-sodium chicken broth
- 1 lemon, sliced
- 2 tablespoons Cajun seasoning
- 1 teaspoon smoked paprika
- ½ teaspoon black pepper
- ¼ teaspoon cayenne pepper (optional)
- 2 tablespoons unsalted butter
For the Cajun Garlic Butter Sauce
- ½ cup unsalted butter, melted
- 3 cloves garlic, minced
- 1 tablespoon Cajun seasoning
- 1 tablespoon fresh lemon juice
- 1 teaspoon smoked paprika
- 1 tablespoon chopped fresh parsley
- ¼ teaspoon red pepper flakes (optional)
For Garnish
- Fresh chopped parsley
- Lemon wedges
- Extra melted butter
- A little Cajun seasoning
Instructions
Step 1: Prepare the Ingredients
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Wash the baby potatoes and cut them in half. Slice the sausage, cut the corn into thirds, and chop the onion. Peel and devein the shrimp if needed, then keep them refrigerated until you’re ready to add them.
Step 2: Layer the Slow Cooker
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Place the potatoes, sausage, corn, and onion in the slow cooker. Spread them into an even layer so the ingredients cook consistently.
Step 3: Add the Cajun Seasoning
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Sprinkle the minced garlic, Cajun seasoning, smoked paprika, black pepper, and optional cayenne over the ingredients.
Pour in the chicken broth. Add the lemon slices and 2 tablespoons of butter.
Gently toss everything to distribute the seasonings.
Step 4: Slow Cook Until the Vegetables Are Tender
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Cover and cook:
- LOW: 4–5 hours
- HIGH: 2–3 hours
Cook until the potatoes are fork-tender and the corn is cooked through. Slow cookers vary, so begin checking toward the earlier end of the cooking time.
Step 5: Prepare the Cajun Garlic Butter
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While the vegetables cook, combine the melted butter, minced garlic, Cajun seasoning, smoked paprika, lemon juice, parsley, and optional red pepper flakes in a small bowl.
Stir until everything is well combined.
Step 6: Add the Shrimp
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Once the potatoes are tender, add the raw shrimp to the slow cooker. Drizzle about half of the Cajun garlic butter sauce over them and gently stir.
Cover and cook on HIGH for approximately 15–25 minutes, checking early. The shrimp are ready when they turn opaque and reach an internal temperature of 145°F (63°C).
Avoid overcooking, as shrimp can become tough and rubbery.
Step 7: Toss and Finish
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Pour the remaining garlic butter sauce over the shrimp, potatoes, corn, and sausage. Gently toss to coat everything evenly.
Taste and adjust with extra Cajun seasoning, lemon juice, or black pepper if needed.
Step 8: Garnish and Serve
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Transfer the shrimp boil to a large serving platter or serve directly from the slow cooker. Garnish with fresh parsley and lemon wedges.
Serve immediately with extra melted Cajun butter on the side!
Tips for the Best Slow Cooker Cajun Shrimp Boil
- Use large shrimp: Large or jumbo shrimp are easier to cook without overdoing them.
- Add shrimp last: Shrimp cook quickly, so never leave them in the slow cooker for the entire cooking time.
- Cut potatoes evenly: Similar-sized pieces help them cook at the same rate.
- Adjust the spice: Cajun seasoning can already contain salt and heat, so taste before adding extra salt.
- Use fresh lemon: A squeeze of lemon brightens the rich butter sauce.
- Don’t add too much broth: This is a butter-coated shrimp boil, not a soup. One cup of broth is enough for the vegetables to cook.
Easy Recipe Variations
1. Make It Spicier
Add extra cayenne pepper, hot sauce, or red pepper flakes to the garlic butter.
2. Add More Seafood
Include chunks of firm white fish or cooked crab meat. Add cooked seafood near the end just to heat through.
3. Use Chicken Sausage
Replace the andouille sausage with smoked chicken sausage for a milder flavor.
4. Add More Vegetables
Bell peppers, celery, or extra corn make delicious additions.
5. Make It Dairy-Free
Replace the butter with a plant-based butter alternative or olive oil.
What to Serve with Cajun Shrimp Boil
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4
This shrimp boil is satisfying on its own, but these sides make it even better:
- Southern-style cornbread
- Creamy coleslaw
- Garlic bread
- Steamed white rice
- Fresh green salad
- Extra Cajun garlic butter for dipping
Storage and Reheating
- Refrigerator: Transfer leftovers to an airtight container within 2 hours and refrigerate at 40°F (4°C) or below. Use within 2 days for best seafood quality.
- Freezer: Freezing cooked shrimp and potatoes is possible, but the shrimp may become rubbery and the potatoes may change texture. Fresh is best.
- Reheating: Warm gently in a covered skillet over low heat with a splash of broth or butter until steaming hot. Avoid prolonged reheating.
- Make Ahead: Chop the vegetables and sausage and prepare the Cajun butter sauce up to one day ahead. Store separately in the refrigerator. Add the shrimp only at the end of cooking.
Frequently Asked Questions
1. Can I put raw shrimp in the slow cooker?
Yes! Add raw shrimp only after the potatoes and corn are tender. Cook on HIGH for approximately 15–25 minutes, checking frequently until the shrimp reach 145°F (63°C).
2. Can I use frozen shrimp?
Yes, but thaw the shrimp completely in the refrigerator first. Drain and pat them dry before adding them to the slow cooker.
3. Can I use frozen corn?
Yes. Frozen corn on the cob pieces can work. Add them with the potatoes and sausage and check that everything is tender before adding the shrimp.
4. Can I make this recipe without andouille sausage?
Absolutely! Smoked turkey sausage, chicken sausage, or another fully cooked smoked sausage works well.
5. Why are my shrimp rubbery?
Shrimp become rubbery when overcooked. Add them only at the end and check frequently. Remove them as soon as they are opaque and reach 145°F (63°C).
6. Is this recipe very spicy?
It has a mild-to-medium Cajun kick, depending on your seasoning. Reduce or omit the cayenne and red pepper flakes for a milder version.
Printable Recipe Card
Slow Cooker Cajun Shrimp Boil
A Southern-inspired seafood dinner with tender shrimp, baby potatoes, corn, smoked sausage, and flavorful Cajun garlic butter.
PREP TIME
15 minutes
COOK TIME
4–5 hours on LOW
TOTAL TIME
About 4½ hours
SERVINGS
6
Ingredients
- 2 pounds large raw shrimp, peeled and deveined
- 1½ pounds baby potatoes, halved
- 1 pound smoked andouille sausage, sliced
- 3 ears corn, cut into thirds
- 1 yellow onion, wedged
- 4 cloves garlic, minced
- 1 cup low-sodium chicken broth
- 1 lemon, sliced
- 2 tablespoons Cajun seasoning
- 1 teaspoon smoked paprika
- ½ teaspoon black pepper
- ¼ teaspoon cayenne, optional
- 2 tablespoons butter
Garlic Butter Sauce
- ½ cup melted butter
- 3 cloves garlic, minced
- 1 tablespoon Cajun seasoning
- 1 tablespoon lemon juice
- 1 teaspoon smoked paprika
- 1 tablespoon chopped parsley
- ¼ teaspoon red pepper flakes, optional
Instructions
- Place potatoes, sausage, corn, and onion in the slow cooker.
- Add garlic, Cajun seasoning, paprika, black pepper, cayenne, broth, lemon slices, and 2 tablespoons butter.
- Cover and cook on LOW for 4–5 hours or HIGH for 2–3 hours, until potatoes are tender.
- Mix the melted butter, garlic, Cajun seasoning, lemon juice, paprika, parsley, and red pepper flakes.
- Add thawed raw shrimp to the slow cooker and drizzle with half the garlic butter.
- Cover and cook on HIGH for approximately 15–25 minutes, checking frequently until shrimp reach 145°F (63°C).
- Add the remaining garlic butter and gently toss.
- Garnish with parsley and lemon wedges. Serve immediately.
Notes
- Add shrimp only after the potatoes are tender.
- Do not use frozen shrimp without thawing first.
- Refrigerate leftovers promptly and use within 2 days.Slow CookerSeafood DinnerCajun
