Easy Sheet Pan Seafood Boil for a Crowd

Why This Sheet Pan Seafood Boil Works for a Crowd

This sheet pan seafood boil delivers sweet shrimp, tender crab legs, smoky andouille, and crisp-tender corn drenched in garlic butter. Roasting everything on heavy-duty sheet pans delivers classic coastal boil flavor without hauling out a 40-quart stockpot or draining gallons of water.

Equipment You Need

• Two 18x13-inch rimmed half-sheet pans
• Large mixing bowl
• Microwave-safe bowl or small saucepan
• Tongs
• Aluminum foil or parchment paper

Step-by-Step Directions

1. Preheat the oven and prep pans. Set your oven to 425°F and line two rimmed baking sheets with heavy-duty aluminum foil for easy cleanup.
2. Par-cook the potatoes and corn. Place halved baby potatoes in a large microwave-safe bowl with 2 tablespoons of water, cover, and microwave on high for 5 minutes until just fork-tender; drain thoroughly.
3. Whisk the seasoned garlic butter. Whisk the melted butter, minced garlic, 2 tablespoons of Old Bay seasoning, and the Cajun seasoning together in a medium bowl until blended.
4. Roast the hearty vegetables and sausage. Divide the par-cooked potatoes, corn pieces, and sliced sausage evenly across both sheet pans. Drizzle with half of the garlic butter sauce and toss to coat. Roast at 425°F for 15 minutes until the sausage browns and edges caramelize.
5. Add the seafood. Remove pans from the oven. Arrange the crab clusters and raw shrimp in a single layer around the hot sausage and vegetables. Pour the remaining garlic butter over the seafood and dust with the remaining 1 tablespoon of Old Bay.
6. Bake until cooked through. Return pans to the oven and roast for 8 to 10 minutes. Remove as soon as the shrimp turn pink, opaque, and reach an internal temperature of 145°F, and the crab is heated through.
7. Garnish and serve. Squeeze fresh lemon wedges over both pans and shower with chopped parsley. Serve immediately straight from the pan or piled on a butcher-paper-lined table.

Host "T-Minus" Prep Timeline

• Day Before: Slice sausage coins, husk and cut corn wheels, thaw crab legs in the refrigerator, and store everything in airtight containers.
• T-Minus 2 Hours: Halve the baby potatoes, mince the fresh garlic, chop the parsley, and measure the spice blend.
• T-Minus 30 Minutes: Preheat the oven to 425°F, line your sheet pans, melt the butter, and par-cook the potatoes.
• T-Minus 10 Minutes: Add the seafood to the roasted vegetable pans and complete the final bake so guests eat hot food right as they arrive.

Scaling for Your Party

Plan for 1/2 pound of shrimp, 1/4 pound of crab, 1/4 pound of sausage, and 2 corn pieces per adult guest. When doubling to 12 servings, use four half-sheet pans and rotate rack positions halfway through baking to ensure even heat. Never crowd ingredients onto a single pan; overlapping traps steam and causes soggy potatoes instead of browned edges.

Substitutions and Dietary Swaps

• Gluten-Free: Check sausage and seasoning labels to confirm no wheat fillers; most standard Old Bay brands are naturally gluten-free.
• Dairy-Free: Replace unsalted butter with an equal amount of plant-based butter sticks or extra virgin olive oil.
• Pork-Free: Swap traditional pork andouille for smoked beef sausage or spicy chicken andouille.
• Shellfish Allergy Alternative: Substitute 2 pounds of 1-inch boneless chicken breast chunks or firm cod fillets for the shrimp and crab, roasting chicken for 12 to 14 minutes until reaching 165°F.

Buffet, Storage, and Food Safety

• Room-Temp Shelf Life: Keep hot seafood above 140°F during serving. Discard or refrigerate any seafood sitting at room temperature after 2 hours (or 1 hour if outdoor ambient temperature exceeds 90°F).
• Keep-Warm Tip: Place sheet pans directly onto low-temp warming mats, or transfer cooked boil components into a slow cooker set to "Warm" with 2 tablespoons of extra melted butter.
• Leftover Storage: Strip meat from crab shells and store seafood, corn, and potatoes in airtight glass containers in the refrigerator for up to 2 days.
• Reheating: Reheat leftovers gently on a rimmed sheet pan tented with foil at 325°F for 8 to 10 minutes until warm, or sauté in a skillet over medium heat with a splash of water and butter to avoid rubbery shrimp.