You can tailor this four-ingredient base to suit your kitchen and your mood without complicating the process. For more heat, stir 1/4 to 1/2 teaspoon crushed red pepper flakes into the melted butter before pouring it over the shrimp.
Finished garlic butter shrimp with lemon and herbs
If you prefer a brighter, more Mediterranean profile, add the finely grated zest of 1 lemon to the butter mixture and finish the cooked shrimp with a squeeze of fresh lemon juice and a handful of chopped fresh parsley. To lean into a Cajun direction, swap the Italian seasoning and salt for 2 teaspoons of your favorite Cajun or Creole seasoning (be mindful of salt levels in blends).
For a slightly lighter dish, you can use 3/4 cup melted butter plus 1/4 cup olive oil instead of all butter, which still gives richness but with a bit more balance. If your shrimp are very large (like U-15 or U-10), expect the cook time to be closer to 1 1/2 hours; smaller shrimp will cook faster, so start checking them earlier.
Food safety tips: Always start with shrimp that are labeled safe for cooking from frozen; most individually quick frozen (IQF) bags from reputable brands are fine. Keep the shrimp frozen until you’re ready to add them to the slow cooker so they don’t linger in the temperature “danger zone” (40°F–140°F).
Packaged frozen shrimp and kitchen prep setup
Cook on LOW rather than WARM so the shrimp pass through that zone quickly and reach a safe temperature; they should be fully opaque and firm. Do not leave cooked shrimp in the slow cooker on the warm setting for more than 1 to 2 hours, as seafood is more perishable than meats like chicken or beef.
Refrigerate leftovers within 2 hours of cooking, and reheat gently on the stovetop over low heat just until warmed through to avoid overcooking.
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