Creamy Cajun Shrimp Pasta Bake

If you are looking for a comforting dinner that combines bold Cajun seasoning, tender shrimp, creamy sauce, pasta, and bubbling cheese, this Creamy Cajun Shrimp Pasta Bake checks every box. It is rich without being complicated, spicy without needing extreme heat, and hearty enough to serve as a complete family meal.

The best part is the contrast of textures. The pasta stays pleasantly tender, the shrimp add a delicate sweetness, the creamy sauce coats every piece, and the cheese develops a golden, slightly crisp layer on top. A little garlic, onion, bell pepper, and Cajun seasoning build the flavor from the beginning, while Parmesan and mozzarella give the casserole that irresistible baked finish.

Ingredients

For the Pasta Bake

• 12 ounces penne or rigatoni pasta
• 1 pound large shrimp, peeled and deveined
• 2 tablespoons olive oil
• 1 small yellow onion, diced
• 1 red bell pepper, diced
• 1 green bell pepper, diced
• 3 garlic cloves, minced
• 2 tablespoons Cajun seasoning
• 1/2 teaspoon smoked paprika
• 1/4 teaspoon black pepper
• 2 tablespoons butter
• 2 tablespoons all-purpose flour
• 2 cups whole milk
• 1 cup heavy cream
• 1 cup freshly grated Parmesan cheese
• 1 1/2 cups shredded mozzarella cheese
• 1/2 cup shredded cheddar cheese
• 1 tablespoon chopped fresh parsley
• Salt, as needed
• 1/4 teaspoon cayenne pepper, optional

How to Make Creamy Cajun Shrimp Pasta Bake

Start by preheating your oven to 375°F (190°C). Lightly grease a 9-by-13-inch baking dish and set it aside.

Bring a large pot of salted water to a boil. Cook the pasta until it is just shy of al dente, following the package directions but reducing the cooking time by about a minute. The pasta will continue cooking in the oven, so slightly undercooking it at this stage helps prevent a soft or mushy finished casserole.

Drain the pasta well and set it aside. Do not rinse it, as the remaining surface starch can help the creamy sauce cling to the noodles.

Season and Cook the Shrimp

Place the peeled and deveined shrimp in a bowl. Add about 1 tablespoon of Cajun seasoning, smoked paprika, and black pepper. Toss until the shrimp are evenly coated.

Heat the olive oil in a large skillet over medium-high heat. Add the shrimp in a single layer and cook for approximately 1 to 2 minutes per side, depending on their size. They should become pink and opaque but do not need to be completely cooked through because they will finish cooking in the oven.

Transfer the shrimp to a plate immediately. This prevents them from becoming rubbery while you prepare the sauce.

Build the Cajun Cream Sauce

Reduce the skillet to medium heat and add the butter. Once melted, add the diced onion and bell peppers. Cook for approximately 5 minutes, stirring occasionally, until the vegetables soften.

Add the minced garlic and cook for another 30 seconds, just until fragrant. Sprinkle the flour over the vegetables and stir continuously for about one minute. This creates a simple roux that will help thicken the sauce.

Slowly pour in the milk while whisking. Add the heavy cream and remaining Cajun seasoning. Continue stirring until the mixture begins to thicken, usually around 4 to 6 minutes.

Stir in the Parmesan cheese until melted and smooth. Taste the sauce before adding salt because Cajun seasoning and Parmesan can already provide plenty of saltiness.

If you enjoy extra heat, add a small amount of cayenne pepper. For a milder pasta bake, simply leave it out.

Assemble the Pasta Bake

Add the cooked pasta to the creamy Cajun sauce and gently stir until every piece is coated. Fold in the cooked shrimp, reserving a few pieces to arrange on top if desired.

Transfer everything to the prepared baking dish. Spread the mixture into an even layer.

Sprinkle the mozzarella and cheddar evenly over the surface. The combination gives you both excellent melting and a deeper cheesy flavor. Add the reserved shrimp on top if you want the finished casserole to look especially inviting.

Bake uncovered for approximately 20 to 25 minutes, or until the sauce is bubbling around the edges and the cheese has melted into a golden layer.

For an extra-browned top, switch the oven to broil for the final 1 to 2 minutes. Watch carefully because cheese can go from beautifully golden to burnt surprisingly quickly.

Remove the casserole from the oven and allow it to rest for about 5 minutes. Finish with freshly chopped parsley before serving.

Tips for the Best Cajun Shrimp Pasta Bake

The most important trick is not to overcook the shrimp. Shrimp cook quickly, and they become firm and rubbery when exposed to too much heat. Searing them briefly before assembling the casserole gives them flavor while allowing the oven to finish the cooking process.

Choose a sturdy pasta shape such as penne, rigatoni, rotini, or ziti. Shapes with ridges and curves hold onto the creamy Cajun sauce particularly well.

For the richest flavor, grate your Parmesan from a block rather than using shelf-stable powdered Parmesan. Freshly grated cheese melts more smoothly and gives the sauce a more pronounced savory flavor.

You can also adjust the spice level to suit your table. Cajun seasoning blends vary considerably in heat and salt, so start conservatively and add more after tasting the sauce.

Easy Add-Ins and Variations

This casserole is flexible, so you can easily customize it. Sliced mushrooms add an earthy flavor, while spinach gives the dish a pop of color and extra vegetables. Add spinach to the sauce during the final few minutes of cooking so it wilts before the pasta goes into the baking dish.

For a heartier version, add sliced smoked sausage or andouille sausage. Cook the sausage with the vegetables before preparing the sauce.

If you want even more seafood, cooked crab meat can be gently folded in alongside the shrimp. Avoid adding too much, though, because the Cajun sauce already has a strong personality.

You can also replace some of the mozzarella with Monterey Jack or pepper Jack cheese. Pepper Jack is particularly good if you want a creamy pasta bake with noticeable heat.

What to Serve With Cajun Shrimp Pasta Bake

Because this pasta bake is rich and creamy, lighter sides work especially well. A crisp green salad with a lemon-based dressing provides acidity that balances the richness of the casserole.

Roasted broccoli, asparagus, or green beans are also excellent choices. If you want something indulgent, serve it with warm garlic bread for soaking up the extra Cajun cream sauce.

A simple squeeze of fresh lemon over each serving can also brighten the dish. The acidity works particularly well with both shrimp and creamy sauces.

Storage and Reheating

Allow leftovers to cool before transferring them to an airtight container. Refrigerate promptly and consume within a few days.

To reheat, place a portion in an oven-safe dish and cover loosely with foil. Warm at 325°F (165°C) until heated through. Adding a tablespoon or two of milk or cream before reheating can help restore some of the sauce’s original creaminess.

Individual portions can also be reheated in the microwave in short intervals, stirring between intervals when possible.

Recipe at a Glance

Prep Time: 20 minutes
Cook Time: 40–45 minutes
Total Time: About 1 hour
Servings: 6
Main Ingredients: Shrimp, pasta, Cajun seasoning, cream, Parmesan, mozzarella, cheddar

This Creamy Cajun Shrimp Pasta Bake is the kind of meal that makes a regular weeknight feel a little more special. The combination of spicy Cajun seasoning, sweet shrimp, creamy garlic sauce, tender pasta, and golden melted cheese creates a satisfying casserole that is easy to customize. Serve it hot with a crisp salad or garlic bread, and you have a cozy dinner that is sure to disappear quickly.