This one-pan buffalo chicken casserole is a spicy, creamy, and cheesy high-protein dinner ready in under an hour. Perfect for keto meal prep and busy weeknights.

Ingredients

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Instructions

Step 1

Preheat your oven to 375°F (190°C) and lightly grease a 9×13-inch baking dish with nonstick spray or a thin layer of butter. This ensures the casserole releases easily and makes cleanup a breeze. While the oven heats, gather all your ingredients: cooked shredded chicken (you can use rotisserie chicken for speed or boil/roast your own), softened cream cheese, buffalo sauce, ranch dressing, shredded cheddar, and optional blue cheese. Softening the cream cheese is crucial—microwave it for 15-20 seconds or leave it on the counter for 30 minutes so it blends smoothly without lumps.

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Step 2

In a large mixing bowl, combine the shredded chicken, softened cream cheese, buffalo sauce, and ranch dressing. Stir vigorously with a spatula or wooden spoon until everything is evenly coated. The cream cheese should be fully incorporated, creating a thick, creamy base that clings to every strand of chicken. If you prefer a milder heat, use less buffalo sauce or substitute half with melted butter. Taste the mixture and adjust seasoning—add a pinch of salt and pepper if needed, but note that buffalo sauce and ranch are already salty.

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Step 3

Transfer the chicken mixture to the prepared baking dish and spread it into an even layer. Use the back of a spoon to smooth the top, ensuring uniform thickness for even cooking. Sprinkle the shredded cheddar cheese generously over the surface, covering every bit of chicken. For an extra kick, scatter crumbled blue cheese on top if you’re using it. The blue cheese adds a tangy, pungent note that beautifully contrasts the spicy buffalo sauce.

Step 4

Place the dish in the preheated oven and bake for 20-25 minutes, until the casserole is bubbly around the edges and the cheese is melted and lightly golden. For a deeper golden crust, switch the oven to broil for the last 2-3 minutes, watching closely to prevent burning. The internal temperature should reach at least 165°F (74°C) if you’re using freshly cooked chicken. Let the casserole rest for 5 minutes before serving—this allows the creamy sauce to set slightly, making it easier to scoop.

Step 5

Garnish with sliced green onions for a pop of color and freshness. Serve hot as a main dish, or portion into meal prep containers. This casserole pairs wonderfully with a side of celery sticks, carrot chips, or a crisp green salad to balance the richness. For a low-carb option, serve over cauliflower rice or zucchini noodles.

For best results

  • For the best texture, use freshly shredded cheese from a block rather than pre-shredded bagged cheese. Pre-shredded cheese contains anti-caking agents like cellulose and potato starch, which can prevent smooth melting and result in a grainy sauce. Shredding your own cheddar ensures a velvety, cohesive cheese layer that stretches beautifully when you lift your fork.
  • If you're meal prepping for the week, assemble the casserole completely but do not bake it. Cover tightly with foil or plastic wrap and refrigerate for up to 2 days. When ready to eat, bake directly from the fridge, adding 5-10 extra minutes to the cooking time. This method locks in freshness and allows the flavors to meld, making the dish even more delicious.
  • To make this casserole even more keto-friendly, use full-fat cream cheese and ranch dressing made with avocado oil or olive oil. Check the labels for hidden sugars—some bottled ranch dressings contain added sugar or corn syrup. Opt for a brand with less than 1g of carbs per serving, or make your own ranch with sour cream, mayo, and herbs.
  • If your casserole turns out too watery, the culprit is likely excess moisture from the chicken or insufficient cooking time. To avoid this, ensure your shredded chicken is patted dry with paper towels before mixing. Also, let the casserole rest for 10 minutes after baking—this allows the sauce to thicken naturally as it cools slightly.
  • For a dairy-free version, substitute the cream cheese with a thick cashew cream (soaked cashews blended with water) or a dairy-free cream cheese alternative. Use a vegan cheddar shred and a ranch dressing made with plant-based ingredients. The texture will be slightly less creamy but still satisfying. Note that vegan cheeses may not brown as well under the broiler.
  • Storage tip: Leftover casserole keeps in an airtight container in the refrigerator for up to 4 days. Reheat individual portions in the microwave for 1-2 minutes, or reheat the entire dish in a 350°F oven for 15-20 minutes. You can also freeze the baked casserole for up to 3 months—thaw overnight in the fridge before reheating.

Variations

  • Spicy Buffalo Chicken Dip Casserole: Turn this into a party-friendly dip by reducing the chicken to 1 pound and adding an extra 4 ounces of cream cheese and 1/2 cup of sour cream. Bake in a smaller dish (8×8-inch) and serve with celery sticks, carrot chips, or low-carb crackers. It's perfect for game day or potlucks.
  • Buffalo Chicken and Broccoli Casserole: Add 2 cups of steamed broccoli florets to the chicken mixture before baking. The broccoli adds fiber, vitamins, and a pleasant crunch that contrasts with the creamy sauce. To keep the broccoli from becoming mushy, blanch it for 2 minutes in boiling water, then shock in ice water before mixing.
  • Smoky Bacon Buffalo Casserole: Cook 6 slices of bacon until crisp, crumble them, and stir half into the chicken mixture. Sprinkle the remaining bacon on top along with the cheese before baking. The smoky, salty bacon amplifies the savory notes and adds a irresistible crunch to every bite.
  • Low-Carb Buffalo Chicken Stuffed Peppers: Use the same filling to stuff 4 large bell peppers (halved and seeded). Place the peppers in a baking dish with 1/4 cup of water at the bottom, cover with foil, and bake at 375°F for 30-35 minutes, then uncover and top with cheese for 5 more minutes. This variation is naturally portion-controlled and colorful.
  • Creamy Buffalo Chicken Zoodle Bake: Swap the shredded chicken for spiralized zucchini (zoodles) for a vegetable-forward, low-carb meal. After baking, the zoodles release water, so be sure to salt them and squeeze out excess moisture before mixing with the sauce. Reduce baking time to 15-18 minutes to keep the zoodles al dente.
  • Keto Buffalo Chicken and Cauliflower Rice Casserole: Mix the buffalo chicken mixture with 3 cups of riced cauliflower (fresh or frozen, thawed and squeezed dry). This bulks up the casserole with extra veggies while keeping carbs minimal. Bake as directed; the cauliflower absorbs the spicy creaminess beautifully.

Nutrition

  • Calories385 kcal
  • Total Fat28g
  • Saturated Fat14g
  • Cholesterol125mg
  • Sodium980mg
  • Total Carbohydrates4g
  • Dietary Fiber0g
  • Sugars2g
  • Protein32g

Common Questions

Can I use canned chicken instead of fresh?
Yes, you can use canned chicken for convenience, but the texture will be softer and less shreddy. Drain the canned chicken well and pat it dry to avoid a watery casserole. For best results, we recommend using freshly cooked chicken—either rotisserie or poached breasts—for a more satisfying, meaty bite.
Is this casserole gluten-free?
Yes, as written, this buffalo chicken casserole is naturally gluten-free. However, always check the labels of your buffalo sauce and ranch dressing, as some brands may contain gluten as a thickener or flavor enhancer. Most major brands like Frank’s RedHot and Primal Kitchen are gluten-free. Serve with gluten-free sides to keep the entire meal celiac-friendly.
How can I reduce the sodium content?
Buffalo sauce and ranch dressing are the main sources of sodium. To lower it, use a reduced-sodium buffalo sauce or make your own by combining melted butter with cayenne pepper, garlic powder, and a splash of vinegar. Similarly, opt for a low-sodium ranch or make a homemade version with Greek yogurt, herbs, and no added salt. Also, choose low-sodium cheese or reduce the amount of cheese by half.
Can I prepare this casserole ahead of time and freeze it?
Absolutely! Assemble the casserole completely but do not bake it. Wrap the dish tightly in plastic wrap, then a layer of aluminum foil, and freeze for up to 3 months. When ready to bake, thaw overnight in the refrigerator, then bake as directed, adding 5-10 minutes to the cooking time. Alternatively, bake the casserole first, let it cool completely, then freeze individual portions in airtight containers for quick grab-and-heat meals.
What can I use instead of ranch dressing?
If you don’t have ranch dressing, you can substitute with an equal amount of sour cream mixed with 1 teaspoon of dried dill, 1/2 teaspoon garlic powder, and 1/2 teaspoon onion powder. Another option is blue cheese dressing for a tangier, more pungent flavor that pairs wonderfully with buffalo sauce. For a dairy-free alternative, use a vegan ranch or a blend of unsweetened coconut yogurt and herbs.
How do I know when the casserole is fully cooked?
The casserole is done when the edges are bubbling vigorously and the cheese on top is melted and golden brown. If you insert an instant-read thermometer into the center, it should register at least 165°F (74°C). Because the chicken is already cooked, you’re essentially just heating everything through and melting the cheese, so don’t overbake or the cream cheese sauce can separate and become oily.
Can I add vegetables to this casserole?
Definitely! This casserole is a great canvas for veggies. Try adding 1 cup of diced celery and 1 cup of chopped bell peppers for a classic Buffalo wing accompaniment. Sauté them briefly in a pan before mixing to soften slightly. Other great additions include steamed broccoli, cauliflower florets, or even spinach (stir in fresh spinach just before baking; it will wilt down). Just be mindful of extra moisture—pat veggies dry before adding.
What are the best sides to serve with buffalo chicken casserole?
To balance the spicy, rich casserole, serve with cooling, crunchy sides. Celery and carrot sticks with extra ranch or blue cheese dip are classic. A crisp green salad with a simple vinaigrette cuts through the creaminess. For low-carb options, try cauliflower rice, zucchini noodles, or roasted Brussels sprouts. If you’re not watching carbs, crusty bread or garlic bread is perfect for sopping up the sauce.