Some nights call for the easiest possible dinner, and this 4-ingredient slow cooker flounder is exactly the kind of recipe that helps on a busy weekday when there is almost no time or energy left for cooking. Using a solid frozen block of flounder fillets keeps prep incredibly simple, and with just a few pantry basics, the fish turns tender and flavorful with almost no hands-on work.
Serve this flounder over rice, buttered noodles, or mashed potatoes to soak up the savory juices. It also pairs well with steamed green beans, roasted broccoli, a crisp side salad, or simple dinner rolls if you want to round it out into a fuller family meal without much extra effort.
4-Ingredient Slow Cooker Flounder
Servings: 4
Ingredients
1 solid frozen block flounder fillets, about 2 pounds
1/2 cup melted butter
1 packet dry Italian dressing seasoning mix, about 0.7 ounces
2 tablespoons lemon juice
Directions
1. Lightly grease the inside of the slow cooker if desired for easier cleanup, then place the solid frozen block of flounder fillets flat in the bottom of the crock.
2. In a small bowl, stir together the melted butter, Italian dressing seasoning mix, and lemon juice until combined.
3. Pour the butter mixture evenly over the frozen fish block, cover, and cook on LOW for 2 to 3 hours, or just until the fish is opaque and flakes easily with a fork. Try not to overcook, since flounder is delicate.
4. Gently separate the fillets with a spoon or spatula, then serve warm with some of the buttery juices spooned over the top.
Variations & Tips
Add garlic: If you want a little more flavor without adding much work, stir 1 to 2 teaspoons of minced garlic into the butter mixture before pouring it over the fish.
Use another mild white fish: This method also works well with frozen cod, tilapia, or haddock, though thicker fish may need a bit more time in the slow cooker.
Watch the cooking time: Slow cookers can vary a lot, and fish cooks quickly once it starts thawing. Start checking early so the flounder stays moist and flaky instead of dry.
Make cleanup easier: A slow cooker liner can be helpful for this recipe, especially since the butter sauce can leave a rich residue around the crock.
Finish with fresh herbs: A little chopped parsley or dill sprinkled on top right before serving can brighten the flavor and make the dish look fresher and more colorful.