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Blackened Fish With Creamy Mustard Sauce Served With Fluffy Rice

Blackened Fish With Creamy Mustard Sauce Served With Fluffy Rice

Blackened fish with creamy mustard sauce and fluffy rice makes a bold, comforting dinner with simple steps and big flavor.
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Prep Time15 minutes
Cook Time20 minutes
Total Time35 minutes
Servings:4
Course:Main Course
Cuisine:American
Ingredients Method Notes

Ingredients
  

  • For the blackened fish
  • White fish fillets tilapia, cod, haddock, mahi-mahi, or catfish, 4 pieces
  • Olive oil or melted butter 1–2 tbsp
  • Paprika 2 tsp
  • Garlic powder 1 tsp
  • Onion powder 1 tsp
  • Dried thyme ½ tsp
  • Dried oregano ½ tsp
  • Cayenne pepper ¼–½ tsp, adjust for heat
  • Salt ¾ tsp
  • Black pepper ½ tsp
  • For the creamy mustard sauce
  • Butter 1 tbsp
  • Garlic 1 clove, minced (optional)
  • Dijon mustard 2 tbsp
  • Whole grain mustard 1 tbsp, optional for texture
  • Heavy cream ¾ cup
  • Chicken or fish broth ¼ cup
  • Lemon juice 1–2 tsp
  • Salt and pepper to taste
  • For the fluffy rice
  • Long-grain rice 1½ cups
  • Water or broth 3 cups
  • Butter or olive oil 1 tbsp, optional
  • Salt to taste

Method
 

  1. Rinse rice until the water runs clearer, then combine with water or broth and a pinch of salt in a pot.
  2. Bring rice to a boil, reduce to low, cover, and cook until tender; let it rest off heat to become fluffy.
  3. Pat fish fillets dry and brush lightly with oil or melted butter so the spices cling evenly.
  4. Mix paprika, garlic powder, onion powder, thyme, oregano, cayenne, salt, and pepper, then coat the fish generously.
  5. Heat a skillet over medium-high until hot; you want a steady sizzle as soon as the fish touches the pan.
  6. Cook fish without moving it at first, letting a deep brown-black spice crust form on the bottom.
  7. Flip carefully and cook until the fish turns opaque and flakes easily at the thickest part.
  8. Remove fish to a plate and lower heat slightly to avoid burning spices left in the pan.
  9. Add butter (and garlic if using) and stir briefly until fragrant, keeping the heat gentle.
  10. Whisk in mustard, then pour in broth and cream, letting the sauce bubble softly and begin to thicken.
  11. Season with salt, pepper, and a squeeze of lemon, simmering until the sauce coats the back of a spoon.
  12. Fluff rice with a fork, plate fish over rice, and spoon creamy mustard sauce on top while everything is warm.

Notes

Blackened Fish With Creamy Mustard Sauce is all about getting bold flavor without crossing into “burnt.” The spice crust should look deep and dark, but it should smell toasted, not acrid. If your pan is too hot, the paprika and garlic powder can scorch before the fish is cooked. Medium-high heat is usually the sweet spot. You want a steady sizzle the moment the fish hits the pan, but not clouds of smoke. Using a little oil or melted butter on the fish helps the seasoning stick and brown evenly, but you don’t need much.
Spice level is easy to control. Cayenne is the main heat driver, so start small if you’re serving kids or anyone sensitive to spice. You can always add a pinch more into the sauce later if you want extra warmth. If your seasoning blend feels too salty, adjust by adding a bit more paprika or oregano to stretch it without changing the flavor too much.
Fish thickness matters. Thin fillets cook fast and can overcook quickly, so keep an eye on the color change. The best doneness cue is opacity: when the center turns opaque and the fish flakes with gentle pressure, pull it. Letting it sit for a minute off heat finishes it without drying it out.
For the sauce, keep the heat gentle once cream goes in. A hard boil can make cream separate or reduce too quickly. If the sauce is too thick, loosen with broth. If it’s too thin, simmer a few minutes longer until it coats the back of a spoon. Mustard varies too—Dijon is smoother and tangy; whole grain adds texture. Use both if you like that speckled look and a slightly deeper bite.
Rice is your quiet foundation. A common ratio for long-grain rice is 1 cup rice to 2 cups water. Rinse first, simmer low with the lid on, then rest off heat for fluffiness. That final rest is what gives you soft, separate grains that soak up sauce beautifully.