This slow cooker 6-ingredient Cajun shrimp boil is one of those set-it-and-forget-it dinners that feels like a special occasion but takes hardly any effort. You literally pour Cajun seasoning over raw shrimp, add just four other pantry-friendly ingredients, and let the slow cooker do the work. It’s inspired by classic Southern shrimp boils, but simplified for busy weeknights in a cozy Midwestern kitchen. The result is a spicy, buttery feast that tends to disappear faster than anything else on the table.
Serve the shrimp, potatoes, and corn straight from the slow cooker or a big family-style platter in the middle of the table. Add lemon wedges for squeezing and extra melted butter on the side for dipping if your crew likes things rich. Warm crusty bread or garlic toast is great for soaking up the Cajun-spiced juices, and a simple green salad or coleslaw helps balance the heat. For a fun touch, spread parchment paper over the table and let everyone dig in with their hands, like a traditional shrimp boil.
Slow Cooker Cajun Shrimp BoilServings: 4
Ingredients
1 1/2 pounds raw large shrimp, shell-on, deveined if possible
1 pound small red potatoes, halved if large
3 ears corn on the cob, cut into 3–4 pieces each
4 tablespoons unsalted butter, cut into pieces
3 tablespoons Cajun seasoning (more or less to taste)
1 cup low-sodium chicken broth
Directions
Place the slow cooker crock on a sturdy, clean surface, like a gray speckled granite countertop. Add the small red potatoes in an even layer on the bottom of the slow cooker.
Arrange the corn pieces on top of the potatoes, nestling them in so they sit fairly snug. This helps everything cook evenly.
Scatter the raw shrimp (shell-on) over the potatoes and corn in a loose, even layer. The shrimp should be on top so they cook gently and don’t get overdone.
In a small bowl, stir together the Cajun seasoning and chicken broth until mostly dissolved. This helps the seasoning spread more evenly. If you prefer, you can sprinkle the Cajun seasoning directly over the shrimp and then pour the broth around the edges of the slow cooker.
Pour the Cajun seasoning mixture evenly over the shrimp, letting it drip down over the potatoes and corn. Make sure the shrimp are all lightly coated with seasoning. This is the moment that will look just like a close-up shot: hands sprinkling or pouring that bold red Cajun seasoning over the raw shrimp in the slow cooker.
Dot the butter pieces over the top of the shrimp and vegetables. As the slow cooker heats up, the butter will melt and mix with the seasoned broth to make a rich, spicy sauce.
Cover the slow cooker with the lid. Cook on HIGH for 2 to 2 1/2 hours, or on LOW for 3 1/2 to 4 hours, until the potatoes are fork-tender and the shrimp are pink and opaque. If your slow cooker runs hot, start checking at the earlier time so the shrimp don’t overcook.
Once done, gently toss everything in the slow cooker with tongs to coat the shrimp, potatoes, and corn in the Cajun butter sauce. Taste the broth and add a pinch of salt if needed, depending on how salty your Cajun seasoning is.
Serve the shrimp boil hot, straight from the slow cooker or transferred to a big platter. Spoon some of the spicy cooking liquid over the top so every serving gets plenty of flavor.
Variations & Tips
For milder palates or picky eaters, cut the Cajun seasoning down to 1–2 tablespoons and offer extra seasoning at the table so spice-lovers can sprinkle more on their own portions. You can also mix half Cajun seasoning and half smoked paprika for a gentler flavor. If your family likes sausage, add 8–12 ounces of sliced smoked sausage or andouille on top of the potatoes before adding the corn. For more veggies, tuck in thick slices of onion or a handful of baby carrots with the potatoes. If you need this dairy-free, swap the butter for a neutral oil or dairy-free butter alternative. For a slightly richer broth, replace half of the chicken broth with low-sodium seafood stock or water plus a squeeze of lemon. Food safety tips: Always start with raw shrimp that is fully thawed if previously frozen; do not add still-frozen shrimp to the slow cooker, as it can affect cooking time and safety. Keep the slow cooker covered while cooking and avoid lifting the lid too often, which can lower the temperature and extend cooking time. Shrimp are done when they are pink, opaque, and just curled; overcooking can make them rubbery. Refrigerate leftovers within 2 hours in a shallow container and use within 2 days, reheating gently just until warmed through to avoid overcooking the shrimp.
