Classic American Seafood Casserole
A hearty, comforting dish blending traditional American flavors with fresh seafood. This american-inspired seafood ready in about 65 minutes pairs cod fillet, medium potatoes, celery for a weeknight-friendly dinner that comes together with one pan and minimal cleanup. Each serving lands at about 300 calories and feeds 4, so it slots cleanly into a weekly meal plan and pairs well with a quick salad or grain on the side. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.
Ingredients
- 12 oz cod fillet
- 2 medium potatoes
- 1/2 cup celery
- 1 small onion
- 1/2 cup milk
- 2 tbsp flour
- 1 tbsp butter
- 1/2 tsp salt
- 1/4 tsp pepper
Instructions
- Step 1: Preheat oven to 375°F (190°C). Dice 2 medium potatoes and 1/2 cup celery into 1/2-inch cubes. Sauté 1 diced onion in 1 tbsp butter over medium heat for 5 minutes until softened.
- Step 2: Add 1 tbsp flour to the onion mixture, stirring for 1 minute. Gradually whisk in 1/2 cup milk until a smooth sauce forms. Season with 1/2 tsp salt and 1/4 tsp pepper.
- Step 3: Place 12 oz cod fillet in a greased casserole dish. Top with the potato-celery mixture and sauce. Bake for 25-30 minutes until the top is golden and the cod is flaky.
- Step 4: Let rest for 5 minutes before serving, allowing the flavors to meld.
Equipment for this recipe
Top-rated tools to make this recipe successfully.
Frequently asked questions
How long does Classic American Seafood Casserole take to make?
Total time is about 65 minutes (30 min prep + 35 min cook). Most home cooks find this fits comfortably into a weeknight; double the batch on Sunday for two dinners.
How do I store leftover Classic American Seafood Casserole?
Cool to room temperature within 2 hours, then store in an airtight container in the fridge for up to 4 days. Reheat covered in a 350°F oven for 10-12 minutes, or microwave at 70% power in 60-second bursts to keep cod fillet from drying out.
Can I substitute ingredients in Classic American Seafood Casserole?
Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.
How do I scale Classic American Seafood Casserole for a different number of people?
The recipe is written for 4 servings. Multiply each ingredient by (your serving target / 4). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.
What goes well with Classic American Seafood Casserole?
American seafood like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.
What others are saying
- ★★★★★
The step-by-step instructions were super clear. Turned out perfect on my first try.
- ★★★★★
Great base recipe! I added a pinch of smoked paprika and it was even better.
- ★★★★☆
Enjoyable meal. Instructions could be a touch more detailed on the timing.
