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Cajun Style Onion Boil Casserole

4.8/5
5 reviews
Cajun Style Onion Boil Casserole
Cajun Style Onion Boil Casserole
80min Total Time
8 people Servings
Medium Difficulty
Moderate Cost
450 kcal Calories

Video

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Ingredients

8
  • 4 large sweet onions, sliced into thick rings and separated carefully
  • 1 pound andouille sausage, cut into 1/2-inch diagonal slices for even cooking
  • 2 pounds baby red potatoes, quartered for consistent cooking time
  • 2 cups fresh or frozen corn kernels, thawed if frozen
  • 2 red bell peppers, cut into chunky strips for texture
  • 4 tablespoons authentic Cajun seasoning blend, divided for layering
  • 3 cups seafood stock or chicken broth for rich flavor base
  • 2 cups heavy cream for luxurious sauce consistency
  • 8 ounces cream cheese, softened to room temperature
  • 2 cups shredded sharp cheddar cheese, divided for layers and topping
  • 1/4 cup unsalted butter, melted for extra richness
  • 3 cloves garlic, minced finely
  • 2 tablespoons fresh thyme leaves
  • 1 tablespoon Old Bay seasoning for authentic flavor
  • Salt and freshly ground black pepper to taste

Instructions

1

Begin by preheating your oven to 375F (190C) and position the rack in the center for optimal heat distribution

2

Generously butter a deep 9x13 inch casserole dish, making sure to coat all corners and sides thoroughly

3

In a large skillet over medium-high heat, brown the andouille sausage until slightly crispy on the edges, about 5-7 minutes

4

Remove the sausage and in the same skillet, saut the onions until they become translucent and slightly caramelized, approximately 10-12 minutes

5

Add the minced garlic to the onions and cook for an additional 2 minutes until fragrant

6

In a large mixing bowl, combine the cream cheese, heavy cream, and half of the Cajun seasoning until smooth

7

Layer half of the potatoes in the prepared casserole dish, followed by half of the onions, sausage, corn, and bell peppers

8

Pour half of the cream mixture over the layers and sprinkle with half of the cheddar cheese

9

Repeat the layering process with remaining ingredients, ending with cheese on top

10

Cover the dish with foil and bake for 40 minutes until the potatoes are tender

11

Remove foil and bake for an additional 15 minutes until the top is golden brown and bubbly

12

Let the casserole rest for 15-20 minutes before serving to allow the sauce to thicken properly

Kitchen Tools

  • Deep 9x13 inch casserole dish for proper layering
  • Large skillet for sauting vegetables and sausage
  • Sharp chef's knife for consistent vegetable cutting
  • Heavy-duty aluminum foil for proper covering during baking

Chef's Tips

Slice all vegetables uniformly to ensure even cooking throughout the casserole
Allow cream cheese to fully soften at room temperature for easier mixing and better sauce consistency
Use authentic Andouille sausage for the most genuine Cajun flavor profile
Pat the corn kernels dry if using frozen to prevent excess moisture in the casserole

Troubleshooting

If sauce is too thin, let the casserole rest longer before serving to allow it to set
If potatoes aren't cooking quickly enough, cover tightly with foil and extend cooking time
If top is browning too fast, tent with foil to prevent burning
If mixture seems dry, add additional cream or broth before final baking phase

Recipe Variations

Seafood Version: Add shrimp, crawfish, or crab meat for an authentic Louisiana seafood boil experience
Spicy Version: Double the Cajun seasoning and add diced jalapeos for extra heat
Vegetable-Heavy Version: Add okra, celery, and mushrooms for more vegetable variety
Low-Country Version: Include smoked sausage and shrimp with Old Bay seasoning

Healthy Alternatives

Substitute heavy cream with half-and-half or whole milk mixed with Greek yogurt for fewer calories
Use turkey or chicken andouille sausage instead of pork for a leaner protein option
Replace half the potatoes with cauliflower florets to reduce carbohydrates
Use reduced-fat cream cheese and light cheddar to decrease overall fat content

Serving Suggestions

Serve with a fresh green salad dressed with light vinaigrette to balance the rich flavors
Offer crusty French bread on the side to soak up the delicious sauce
Garnish with fresh chopped parsley and extra thyme leaves for color and freshness
Accompany with steamed green vegetables like broccoli or asparagus for added nutrition

Nutrition Facts

450
Calories
22g
Protein
35g
Carbs
28g
Fat

Dietary Info

Can be adapted for gluten-free diets as it contains no wheat products
Suitable for low-carb diets when substituting potatoes with more vegetables
Not recommended for vegetarian or vegan diets due to meat and dairy content
Can be modified for dairy-free diets using coconut milk and dairy-free cheese alternatives

Garnish Ideas

Fresh chopped parsley sprinkled generously over the top
Sliced green onions for added color and flavor
Extra sprinkle of Cajun seasoning for visual appeal
Lemon wedges on the side for brightness

Storage

Store leftovers in an airtight container in the refrigerator for up to 4 days
When reheating, add a splash of cream or broth to maintain moisture
Freeze portions in freezer-safe containers for up to 2 months
Thaw frozen portions overnight in the refrigerator before reheating

Leftover Ideas

Transform into a breakfast hash by chopping and crisping in a skillet with eggs
Use as a filling for savory hand pies or empanadas
Create a new casserole by adding rice and extra vegetables
Make into a soup by adding additional broth and cream

Common Mistakes to Avoid

Not allowing enough time for the potatoes to cook through completely before removing the foil
Using cold ingredients straight from the refrigerator which can affect cooking time and texture
Oversalting the dish without accounting for the natural saltiness of the andouille sausage
Cutting vegetables in inconsistent sizes which leads to uneven cooking

Frequently Asked Questions

Can I make this casserole ahead of time?

Yes, you can assemble it up to 24 hours in advance and refrigerate before baking

What's the best potato to use?

Baby red potatoes work best as they hold their shape well during cooking

Can I freeze this casserole?

Yes, but the cream sauce may separate slightly upon thawing

How spicy is this dish?

It's moderately spicy but can be adjusted by varying the amount of Cajun seasoning

Reviews

Sarah M.
Mar 5, 2026
This casserole brought me right back to New Orleans! The flavors are absolutely perfect.
Michael R.
Mar 10, 2026
Great dish but needed a bit more kick for my taste. Added extra Cajun seasoning.
Jennifer P.
Mar 7, 2026
The best comfort food I've made in ages! My family begged for seconds.
Robert K.
Mar 3, 2026
Solid recipe that's definitely worth the prep time. The leftovers were even better!
Lisa B.
Feb 28, 2026
Perfect potluck dish! Everyone wanted the recipe.
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