Instant Pot Catfish and Brussels Sprouts Casserole

In a pressure cooker, the timer is only part of the cooking. The pot spends several minutes heating up before it reaches pressure, and several more releasing it, and food keeps cooking through both. That is why ingredients as delicate as catfish and Brussels sprouts need almost no time at pressure. Instant Pot Catfish and Brussels Sprouts Casserole is built on that fact: the sprouts cook in a creamy sauce at pressure with a zero-to-one-minute timer, and the catfish steams gently on top afterward, so neither ends up mushy.

A note on the word casserole: nothing here bakes for an hour. Creamy, cheesy Brussels sprouts made in the Instant Pot are a published recipe that sits between a casserole and a gratin, and pressure-cooked fish fillets, including catfish, are also documented. This version layers the two, and a quick buttered breadcrumb topping adds the crunch a baked casserole would have.

Key Techniques for Pressure-Cooked Catfish and Sprouts

The dish takes about 40 minutes in total, but only about 3 of those minutes are at pressure. Cook the sprouts for 0 to 1 minute, then steam the catfish for 2 minutes on low pressure, and check that the fish reaches 63°C (145°F) before serving.

Pressure raises the boiling point of water, so the pot cooks at roughly 115°C (240°F) instead of 100°C (212°F). That speeds cooking dramatically, which is useful for tough foods and risky for tender ones. Halved Brussels sprouts soften in under a minute at pressure, and cooking them longer releases sulfur compounds that give overcooked cabbage-family vegetables their strong smell and mushy texture.

Catfish gets a gentler treatment. It sits above the sprouts rather than in the liquid, so it steams, and a low-pressure setting limits the intensity. Cream goes in after the pressure stage, because dairy added before can scorch on the pot bottom and trigger a burn warning. Cheese is stirred in off pressure so it melts into the sauce instead of clumping or sticking.

Ingredients

This serves 4.

For the Sprouts

• 1 1/4 lb (570g) Brussels sprouts, trimmed and halved
• 1 tablespoon (14g) butter
• 2 garlic cloves, minced
• 3/4 cup (180ml) chicken or vegetable broth
• 1/2 cup (120ml) heavy cream
• 1 cup (100g) shredded sharp cheddar
• 1/2 teaspoon onion powder
• Salt and black pepper, to taste

For the Catfish

• 4 catfish fillets (about 5 oz / 140g each, 1/2 to 3/4 inch / 1.3 to 2cm thick)
• 1 teaspoon paprika
• 1/2 teaspoon garlic powder
• 1/2 teaspoon salt
• 1 tablespoon (15ml) lemon juice

For the Crunchy Topping

• 1/2 cup (30g) panko breadcrumbs
• 1 tablespoon (14g) butter
• 2 tablespoons (8g) fresh parsley, chopped

How to Make Instant Pot Catfish and Brussels Sprouts Casserole

1. Pat the catfish dry. Rub with the paprika, garlic powder, salt, and lemon juice, and refrigerate while you prepare the sprouts.
2. Set the Instant Pot to Sauté. Melt the 1 tablespoon butter and cook the garlic for 30 seconds, until fragrant.
3. Add the sprouts, broth, onion powder, salt, and pepper, and stir. Cancel Sauté. Scrape the bottom to release any stuck bits, which prevents a burn warning.
4. Lock the lid, set the valve to Sealing, and cook on High Pressure for 0 minutes. For softer sprouts, set 1 minute. Quick release as soon as the cycle ends.
5. Open the lid. The sprouts should be bright green and tender when pierced, not gray. Stir in the cream and cheddar until smooth and melted.
6. Lay the catfish fillets in a single layer on top of the sprouts, not pressed down. Lock the lid and cook on Low Pressure for 2 minutes. Let the pressure release naturally for 3 minutes, then quick release.
7. Open the lid. The fish should look opaque and flake easily, with a thermometer reading 63°C (145°F). If it is underdone, replace the lid and let it sit on Keep Warm for 2 to 3 minutes.
8. While the fish rests, melt the remaining butter in a skillet over medium heat. Add the panko and toast for 2 to 3 minutes, stirring, until golden brown and fragrant.
9. Spoon the sprouts and sauce into bowls, top with a fillet, and sprinkle with the buttered panko and parsley.

Good vs. Excellent: The Details That Matter

• Quick-release the sprouts immediately. Waiting on natural release keeps them cooking and turns them soft.
• Add cream and cheese after pressure. They would scorch or clump before.
• Choose fillets of even thickness. Thin tails overcook before the thick ends are done.
• Use a thermometer. Pressure cookers take different times to heat, so the clock is a rough guide.
• Toast the panko separately. Steam softens anything that sits on top inside the pot.

Troubleshooting Common Problems

Problem: The Instant Pot showed a burn warning. Cause: sauce or cream stuck on the bottom, or too little thin liquid. Solution: scrape the bottom after sautéing, keep thick ingredients on top of the liquid, and add cream only after pressure.

Problem: The sprouts were mushy and sulfurous. Cause: too long at pressure or a slow release. Solution: set 0 to 1 minute and release the pressure right away.

Problem: The catfish was dry or rubbery. Cause: it cooked too long at high pressure. Solution: use low pressure for 2 minutes, then rely on residual heat.

Problem: The sauce was thin. Cause: the sprouts released water or the cheese did not melt fully. Solution: stir in another handful of cheese, and press Sauté for a minute to reduce.

Mastering the Technique

The idea that carries over is staging by delicacy in a pressure cooker. Sturdy ingredients go in first at pressure; tender ones, such as fish or dairy, join in a second, shorter step. The same pattern works with chicken and green beans, or shrimp and rice. When in doubt, undercook and extend, because it is easy to add a minute but impossible to take one back.

One doneness cue is the flake test: gently press a fork into the thickest part of the fillet. It should separate into moist, opaque flakes. If it resists or looks translucent, give it a short additional rest on Keep Warm.

Variations and Substitutions

Tilapia, cod, or haddock can replace catfish with the same timing. Broccoli or cauliflower florets can replace the sprouts, with similar timing. Swap cheddar for Gruyère or Monterey Jack, and cream cheese can replace the cream for a thicker sauce. A few strips of crisp bacon on top add smoke, and a pinch of cayenne in the fish rub adds heat. For a browned top, transfer the sprouts to a baking dish, sprinkle with cheese, and broil for 2 to 3 minutes.

Serving and Pairing

Serve over rice or mashed potatoes to soak up the cheese sauce, or with crusty bread. A simple tomato and cucumber salad cuts the richness. Hot sauce and lemon wedges at the table suit the catfish.

Storage and Reheating

Refrigerate leftovers in an airtight container for up to 2 days, keeping the panko separate. Reheat gently in a covered skillet or the microwave at 50% power until hot at 74°C (165°F), stirring the sauce. Do not freeze, since the cream sauce splits and the fish turns watery.

Nutritional Information

Values below are estimates per serving and will vary depending on exact brands and quantities used.

Frequently Asked Questions

Can I use frozen catfish? Yes, but thaw it first for this layered method. Frozen fillets release a lot of water and cook unevenly on top of the sprouts.

Why zero minutes for the sprouts? The time the pot spends heating up and releasing already cooks halved sprouts. A longer cycle makes them soft and sulfurous.

Does this need an oven? No. The panko is toasted in a skillet, and broiling is optional if you want a browned cheese top.

Instant Pot Catfish and Brussels Sprouts Casserole depends on respecting how little time delicate food needs under pressure: sprouts cooked almost instantly, fish steamed gently above, and cream and cheese added at the end. It is a quick, creamy dinner, with a topping that supplies the crunch the pressure cooker cannot.