Fill a large pot with water, place the pot over high heat, and bring the water to a boil. Make sure you leave enough room for the ingredients so it doesn’t overflow.
Add the cajun seasoning, Old Bay seasoning, minced garlic, and halved lemons to the boiling water. Mix well.
Slowly add the red baby potatoes to the pot and cook them for 10 minutes until they are slightly tender but not fork-tender.
Add the smoked sausage and corn to the pot and cook for another 5 minutes.
Gently place the crabs or crab legs into the pot, ensuring they are fully submerged.
Once the crab legs turn opaque, reduce the heat to medium and cook for 5-7 minutes more.
Use tongs or a slotted spoon to remove the cooked ingredients from the pot and transfer them to a large serving platter or a newspaper-lined table for a more authentic and aesthetic experience.
Sprinkle additional cajun seasoning, cayenne pepper or chili flakes, and salt over the boiled seafood and vegetables to taste.
Serve the melted butter, lemon wedges, your favorite dipping sauces, and your preferred side dishes.