Authentic Cajun Garlic Butter Crab Boil: An Easy Sheet Pan Recipe

Transform your next family dinner into a spectacular Southern feast with this Sheet Pan Cajun Garlic Butter Crab Boil. While a traditional seafood boil can feel like a full-day production, this clever single-pan method delivers those same rustic, bold flavors in under 30 minutes. It’s the perfect way to serve an impressive, "cozy" meal that feels like a celebration but cleans up in a flash.

If you enjoy the deep, cozy flavors of our Chicken & Sausage Gumbo or One-Pot Jambalaya, you are going to love this recipe. It’s a spectacular, high-protein alternative to Blackened Catfish that pairs succulent seafood with an irresistible pool of rich garlic-Cajun butter.

Why You’ll Love This

• One-Pan Magic: No massive pots or outdoor burners required—just one sheet pan and your oven.

• Pro Results at Home: Using the "Holy Trinity" foundation gives you that authentic restaurant flavor with zero stress.

• Maximum Flavor: Roasting the seafood allows the garlic butter to caramelize and stick to the shells rather than washing away in boiling water.

Recipe Card

• Prep Time: 15 minutes

• Cook Time: 25 minutes

• Servings: 6-8

• Difficulty: Easy

Nutrition Information

(Per Serving)

• Calories: 380 kcal

• Protein: 32g

• Net Carbs: 14g

• Fat: 21g

Ingredients

• 3 lbs King or Snow Crab Legs, cracked

• 1.5 lbs jumbo shrimp, shell-on

• 1 lb Andouille Sausage, sliced into rounds

• 4 ears of corn, halved

• 1.5 lbs mini red potatoes, whole

• 1 Yellow onion, quartered

• 2 stalks of celery, halved

• 1 green bell pepper, quartered

• 1/2 cup unsalted Butter, melted

• 1/4 cup Olive Oil

• 3 tbsp Cajun Seasoning

• 1 tbsp minced Garlic

• Fresh parsley and lemon wedges for garnish

Instructions

1. Preheat: Set your oven to 400°F.

2. The Flavor Base: In a small bowl, whisk together melted butter, olive oil, Cajun seasoning, and minced garlic.

3. Assemble: Arrange the crab, shrimp, sausage, corn, potatoes, and your "Holy Trinity" (onion, celery, pepper) on a large, heavy sheet pan.

4. Smother: Drizzle the garlic butter mixture over everything. Use your hands to toss the ingredients until every piece is coated.

5. Roast: Bake for 20–25 minutes. Halfway through, give the pan a gentle shake or turn the ingredients with tongs to ensure even cooking.

6. Serve: Garnish with fresh parsley and lemon. Serve it right on the pan for that rustic, communal feel!

Tips & Variations

• Master the "Holy Trinity": For that authentic Cajun base, we use a 2:1:1 ratio: two parts onion, one part celery, and one part green bell pepper. This balance provides the aromatic foundation that makes the seafood truly pop.

• The Heat Scale: This recipe is a comfortable medium. To keep it kid-friendly, use a mild Cajun blend. If you like it "swicy," drizzle a little hot honey over the pan in the last 5 minutes of baking.

• The Sizzle Shot: To get those perfectly charred edges on the sausage and peppers, make sure your oven is fully preheated before the pan goes in.

Make-Ahead & Storage

• Make-Ahead: You can chop your "Trinity" vegetables and slice the sausage up to 2 days in advance.

• Storage: Keep leftovers in an airtight container for up to 3 days.

• Reheating: Reheat in the oven at 350°F, covered with foil, for 10 minutes to keep the seafood tender.

FAQ

Should I boil the potatoes first? If your red potatoes are larger than a golf ball, par-boil them for 5 minutes before adding them to the sheet pan to ensure they are fork-tender.

Can I use frozen seafood? Yes, just ensure the crab and shrimp are fully thawed and patted dry before adding the butter sauce so it sticks properly.

What should I serve this with? While it is a complete meal, it pairs fantastically with a basket of Cajun Cornbread for soaking up the pooled Cajun garlic butter sauce or alongside a bowl of Cajun Coleslaw to cut through the richness.

Final Thoughts

This Sheet Pan Cajun Crab Boil recipe is the ultimate "Cozy Home" shortcut to a luxury meal. It brings all the excitement of a Louisiana boil to your kitchen table without any of the hassle. Pour a little extra butter over the top, grab some napkins, and dive in!

If you love comfort food, try our casserole recipes or browse the Cajun Recipes hub filled with classic dishes and easy dinner ideas.