1-First Step: Heat the oven and prep the pan Start by heating your oven to 425°F. Line a baking sheet with parchment paper or lightly grease it so the fish does not stick. If you want extra crisp edges, place a wire rack on top of the baking sheet. This helps hot air move around the fish, which can make the crumbs brown more evenly.

2-Second Step: Prepare the fish Pat the fish dry with paper towels. This step matters because too much moisture can make the crumb coating slide off. Season the fish lightly with salt and pepper on both sides. Cut the fish into even pieces so they cook at the same rate. If your fillets are very thick, you can slice them into smaller portions for faster baking.

3-Third Step: Mix the crumb coating In a bowl, combine the panko breadcrumbs, melted butter, Cajun seasoning, and lemon zest. Stir until the crumbs are lightly coated. If you are using crushed crackers or cornflakes instead of panko, mix them the same way. The butter helps the topping brown and gives it a richer flavor. You can also taste the crumb mixture before it goes on the fish. If you want it a little spicier, add more Cajun seasoning. If you prefer a milder flavor, use the suggested blend of smoked paprika, garlic powder, thyme, and oregano. That gives you a gentle seasoning that still tastes full and savory.

4-Fourth Step: Stir the creamy binder In another bowl, mix the mayonnaise, Dijon mustard, lemon juice, and thyme. This mixture acts like a glue that helps the crumbs stick to the fish. It also adds moisture, so the fish stays tender while baking. Spread a thin layer over each piece of fish using a spoon or pastry brush. If you are making this for kids or anyone who likes a milder flavor, keep the mayo layer light. If you want a stronger tang, add a little extra Dijon mustard. The recipe stays flexible, which is one reason Oven Baked Crumbed Fish works so well for mixed households.

5-Fifth Step: Coat the fish Press each piece of fish into the crumb mixture, gently patting the topping onto the surface. Do not press too hard. A light press gives you a crisp crust instead of a heavy one. Put the coated fillets on the prepared baking sheet, leaving a little space between each piece so they bake instead of steam. If you are using very thin fillets, watch them closely. Thin fish can cook fast and dry out if left in the oven too long. For thicker pieces, keep the crumb layer even from end to end so the coating browns at the same speed as the fish cooks.

6-Sixth Step: Bake until golden Bake for 12 to 15 minutes, depending on the thickness of the fish. The coating should look golden and crisp, and the fish should flake easily with a fork. The internal temperature should reach 145°F. If you want even more color, switch the oven to broil for the last 1 to 2 minutes, but watch it closely so the crumbs do not burn. For a gluten-free version, the baking time stays about the same. For a lower-calorie version, use a lighter mayo or yogurt mixture and keep the coating thin. That still gives you a satisfying crunch without adding much extra fat.

7-Final Step: Serve with lemon and dipping sauce Take the fish out of the oven and let it rest for a minute or two. Serve it with lemon wedges and your favorite sauce. Tartar sauce gives you a classic pairing, while seafood cocktail sauce, plum sauce, honey mustard, spicy mayo, or lemon garlic mayo each bring a different flavor. The fresh lemon at the table wakes up the whole dish and makes the crumb topping taste even brighter.