This Whole30 Chicken Bacon Ranch Casserole uses a roasted spaghetti squash base and is packed with tender chicken breast, homemade bacon bits, and plenty of vegetables. It’s hearty, flavorful, and suitable for anyone following Whole30—or anyone who just wants a satisfying, low-carb casserole.
Jump to Recipe
A quick note of gratitude to the blogger who inspired the spaghetti squash casserole base concept years ago — Juli Bauer at PaleOMG — whose Buffalo Chicken Casserole showed how well spaghetti squash works as a casserole foundation. I adapted the idea for this Whole30-friendly chicken bacon ranch version and it turned out great.
If you like veggie-forward casseroles with spaghetti squash, try other recipes from the blog for more ideas, such as Meat Lover’s Spaghetti Squash Pizza Casserole, a Low Carb Spaghetti Squash Spaghetti Bake, or a Veggie-Loaded Rotisserie Chicken Casserole.
What makes this casserole Whole30 approved?
This casserole is designed to follow Whole30 guidelines: it contains no dairy, no grains, no added sugar, and no legumes or unwanted additives. The spaghetti squash replaces traditional starches, and the ranch dressing used in the recipe is compliant when you choose a Whole30-approved brand or make your own at home.
Even if you’re not doing Whole30, this recipe works well as a general low-carb, protein-forward dinner. If you don’t need to avoid dairy, you can customize the casserole with your preferred ranch or even add cheese.
How do you make spaghetti squash casseroles?
Simple overview: roast or steam the spaghetti squash, cook the other ingredients (meat and vegetables), combine everything with a compliant sauce and eggs, transfer to a casserole dish, and bake until set and golden.
More detail: Cook your spaghetti squash using your preferred method—oven roasting for about 40–45 minutes at 400°F, or steam it in an Instant Pot for 7–8 minutes on high pressure. Let it cool, then scrape the strands out with a fork into a large bowl. This step can be done a day ahead.
While the squash cooks, brown your bacon and then sauté the chicken and vegetables in the bacon fat (or another cooking fat if you prefer). Once everything is cooked, combine the squash strands, bacon bits (reserve a little for topping), chicken and vegetables, a cup of compliant ranch dressing, and eggs to bind. Transfer to a greased 9×13 dish and bake at 375°F for about 45–55 minutes until the top is golden. A quick broil at the end crisp up the top if desired.
How do I cook the spaghetti squash?
Two reliable methods:
- Oven roast: Cut the squash lengthwise, place the halves cut-side-down on a lined baking sheet, and roast at 400°F for 35–45 minutes until the flesh is tender. Flip and scrape with a fork to create strands.
- Instant Pot steam: Cut the squash in half widthwise, place on the trivet with 1 cup of water, and steam on high pressure for about 8 minutes, then allow a natural pressure release. Cool slightly and scrape out the strands.
What kind of Ranch dressing do you use?
To keep the casserole Whole30-compliant, choose a ranch dressing made without dairy, sugars, or non-compliant oils. If you aren’t concerned about Whole30 rules, any favorite ranch will work. You can also make a homemade compliant ranch dressing using mayonnaise made from compliant oil, coconut milk or compliant mayo base, and fresh herbs and seasonings.
Making your own dressing is a cost-effective option and lets you control ingredients.
How long will the leftovers last?
Stored in an airtight container, leftovers keep for about 4 days in the refrigerator. Reheat portions in the microwave for 90 seconds to 2 minutes depending on quantity. The casserole should also freeze well; store in a freezer-safe container for up to 3–4 months and thaw overnight before reheating.
Where to find Whole30-compliant bacon and chicken
Look for bacon labeled “no added sugar” and meats that are raised without hormones or antibiotics. Many specialty meat suppliers and some grocery stores offer compliant options. Purchasing higher-quality, sugar-free bacon and ethically raised chicken can make a noticeable difference in flavor and peace of mind when following Whole30.
I personally prefer ordering meat from reputable suppliers that focus on quality and transparency.
More dinner ideas from Project Meal Plan
- Buffalo Chicken Quinoa Bake
- Simple Salsa Baked Chicken Thighs
- Freezer Friendly Black Bean Burgers
Whole30 Chicken Bacon Ranch Casserole
Recipe by Danielle
A hearty, vegetable-forward casserole using spaghetti squash, chicken, bacon, and compliant ranch dressing. Great for meal prep and leftovers.
- Total Time1 hour 25 minutes
- Yield8 servings
Ingredients
- 1 medium spaghetti squash (2–3 pounds)
- 8–10 ounces raw bacon strips (no added sugar or preservatives), cut into bits
- 1 red bell pepper, diced
- 1 small onion, diced (red or yellow)
- 2 stalks celery, diced
- 2 cloves garlic, minced
- 1 pound raw chicken breast, cut into 1-inch chunks
- 1 cup compliant Ranch dressing (use a Whole30-compliant brand or homemade)
- 3 large eggs
- Salt and pepper, to taste
Instructions
Cook the spaghetti squash (can be done a day ahead):
- Oven roast: Preheat oven to 400°F. Cut squash lengthwise and place halves cut-side-down on a lined baking sheet. Roast 40–45 minutes until tender. Cool slightly and scrape the flesh into a large bowl with a fork. Reduce oven heat to 375°F for the casserole.
- Instant Pot: Cut squash in half widthwise, place on a trivet with 1 cup water, and steam on high pressure for about 8 minutes with a natural release. Cool and scrape the strands into a large bowl.
Cook the meats and vegetables:
- Heat a Dutch oven or large skillet over medium heat. Add bacon bits and cook 8–10 minutes until browned and crispy. Remove the cooked bacon to a paper towel–lined bowl and leave about 2 tablespoons of bacon fat in the pan (or drain and replace with another fat if you prefer).
- Add diced bell pepper, onion, celery, garlic, and chicken pieces to the pan. Sauté over medium heat for 10–12 minutes, until the chicken is cooked through and the vegetables are tender.
Assemble and bake:
- Preheat oven to 375°F. In the large bowl with the cooked spaghetti squash, combine the bacon bits (reserve a small handful for topping), the chicken and vegetable mix, 1 cup ranch dressing, 3 eggs, and 1/4 teaspoon each of salt and pepper. Stir until well combined.
- Transfer the mixture to a greased 9×13 casserole dish and spread evenly. Sprinkle the reserved bacon bits on top.
- Bake at 375°F for 45–55 minutes, until the top is golden and the casserole is set. For a crisper top, broil for 1–2 minutes at the end, watching carefully. Store leftovers in an airtight container and enjoy within 4 days.
Equipment
- 9×13 casserole dish
- Large Dutch oven or deep skillet
- Instant Pot (optional) or oven for roasting the squash
- Mixing bowls and spatula
Notes
Bacon: For best results, use sugar-free bacon to keep the casserole Whole30-compliant. You can make homemade bacon bits by baking or pan-frying whole slices until crisp, then chopping them.
Adapted from the spaghetti squash casserole concept popularized on several Whole30 and paleo blogs. Nutrition information was estimated using a nutrition tracker and will vary based on ingredient brands and portion sizes.
- Prep Time: 10 minutes
- Cook Time: 1 hour 15 minutes
- Category: Dinner
- Method: Baked
- Cuisine: American
Nutrition
- Serving Size: 1/8 of casserole
- Calories: 366 (estimated)
- Fat: 28g (estimated)
- Carbohydrates: 11g (estimated)
- Protein: 19g (estimated)
Whether you’re on a Whole30 or simply looking for a satisfying, lower-carb casserole, this Whole30 Chicken Bacon Ranch Casserole is a great option for dinner and meal prep. Enjoy and feel free to customize the vegetables and seasonings to suit your taste.
