Preheat your oven to 400°F (200°C) to ensure it reaches the right temperature for roasting.

Wash and cut the baby potatoes into bite-sized pieces or par-cook in the microwave for 4-5 minutes.

Combine the melted butter, minced garlic, and Old Bay seasoning in a bowl to create a rich sauce.

Add the par-cooked potatoes, corn, and half of the butter mixture to the sheet pan and toss to coat.

Roast in the oven for 15 minutes until potatoes cook through and corn becomes tender.

Add the smoked sausage to the sheet pan and toss with the other ingredients, then roast for another 10 minutes.

Add the large shrimp and toss gently with the remaining butter mixture; roast for 6-9 minutes until shrimp are pink.

Remove from the oven, squeeze lemon juice over the dish, and garnish with parsley if desired.