This BBQ chicken spaghetti squash is one of those weeknight heroes I discovered when a single squash and some leftover cooked chicken stared back at me from the counter. I first made it on a busy Sunday night after a weekend of grilling and wanted something that felt indulgent but kept carbs low. The roasted squash becomes tender, slightly sweet strands that cradle a smoky, saucy chicken filling. The contrast of the soft squash, the tangy barbecue, and the little pops of sautéed pepper and onion make every bite exciting.

I love this dish because it feels like a personal-sized casserole baked into an edible bowl. It’s forgiving: use leftover rotisserie chicken, grill a breast, or poach in an Instant Pot. When I brought these to my family, even folks who usually avoid low-carb plates asked for seconds. The recipe scales easily, freezes well, and makes a colorful, comforting meal that shows up beautifully at a casual dinner or a potluck.

Ingredients

• 1 medium spaghetti squash: Choose a firm squash around 2 to 3 pounds with no soft spots. The squash provides the “noodle” base—its slightly sweet flavor balances the tangy barbecue. I often buy local produce for firmer texture and better sweetness.
• 12 ounces boneless skinless chicken breast (about 2 cups cooked, chopped): Use leftover rotisserie chicken for speed or poach in an Instant Pot for tender results. The chicken is the hearty protein that carries the BBQ flavor.
• 1/4 to 1/2 green bell pepper, diced: Adds a fresh crunch and bright color. Use more if you want extra vegetables; red or yellow bell peppers also work well.
• 1/4 red or white onion, sliced or chopped: Sautéed until soft and slightly caramelized, the onion adds depth and a little sweetness.
• 1/3 cup favorite barbecue sauce: Pick a brand you love—sweet Kansas City-style or vinegar-forward Carolina-style will change the profile. If you need gluten-free, check the label.
• 2 ounces grated cheese plus extra to taste: Sharp cheddar or a blend melts beautifully; reserve a little for topping. Use dairy-free cheese if avoiding dairy.
• Optional extras: Jalapeño slices, fresh parsley or cilantro, extra BBQ sauce for drizzling, ranch dressing, or any extra veggies you love.

Instructions

Prepare the oven and squash:Preheat the oven to 400 degrees F. Slice the squash lengthwise and scoop out seeds. For easier cutting, microwave each half 4 to 5 minutes to soften slightly. Rub the cut sides with a little olive oil, place cut-side down on a rimmed baking sheet or in a baking dish, and roast for about 40 minutes until a fork pierces easily.Cook the chicken:While the squash roasts, cook your chicken. For very tender results, add 12 ounces of chicken and 1 cup water to an Instant Pot and cook 5 minutes on high with a natural pressure release. Alternatively, grill, bake at 375 degrees F for 20-25 minutes, or shred leftover rotisserie chicken. Once cooked, chop or shred and stir in 1/3 cup barbecue sauce.Sauté the vegetables:Heat a skillet over medium-high with a drizzle of oil. Sauté the diced green pepper and chopped onion until softened and lightly caramelized, about 6 to 8 minutes. Season with a pinch of salt and add to the sauced chicken, stirring to combine.Fluff the squash strands:When the squash is tender, remove from oven and let cool slightly until you can handle it. Use a fork to scrape the interiors, creating long spaghetti-like strands. Remove about half to three-quarters of the strands to mix with the chicken filling, leaving some to help support the stuffed boat.Assemble and bake:Toss the spaghetti squash strands with the BBQ chicken and veggies and a bit of the grated cheese. Spoon the mixture back into the squash halves, pile on the remaining cheese, and bake at 350 degrees F for 10 to 15 minutes until cheese is melted and edges are bubbly and golden.Finish and serve:Top with a drizzle of extra barbecue sauce or ranch, add jalapeño slices or fresh herbs if desired, and serve with a green salad or fresh veggies. Enjoy immediately.

Storage Tips

To store leftovers, cool the squash boats to room temperature then refrigerate in airtight containers for up to 4 days. Store the filling separately from the baked squash if you want to preserve texture—this prevents the shell from getting soggy. For longer storage, wrap tightly with plastic and aluminum foil or use freezer-safe containers and freeze for up to 3 months. Reheat from frozen in a 350 degrees F oven until warm throughout, or thaw overnight and reheat for 15 to 20 minutes. Use a probe thermometer to ensure the center reaches 165 degrees F when reheating from frozen.

Ingredient Substitutions

If you’re out of chicken, shredded turkey or cooked pulled pork both make excellent alternatives and pair beautifully with BBQ sauce. Replace cheddar with Monterey Jack, mozzarella, or a dairy-free meltable cheese to suit preferences. Swap bell pepper for diced zucchini or mushrooms for a lower-sugar option. If avoiding sugar in BBQ sauce, use a sugar-free or homemade vinegar-based sauce; note that sweetness and mouthfeel will change. For a vegetarian twist, replace chicken with smoked tempeh or seasoned chickpeas, though the protein and texture will differ.

Serving Suggestions

Serve these squash boats with a crisp leafy salad or a tangy slaw to cut through the richness. Fresh coleslaw with a light vinaigrette or a lemony arugula salad adds brightness. For kid-friendly plating, offer extra grated cheese and a side of carrot sticks with ranch. Garnish with chopped cilantro or parsley and a few jalapeño slices for color and heat. Drizzle extra barbecue on the finished boats and consider a dollop of sour cream for a richer finish.

Cultural Background

While stuffed vegetable boats are a universal concept, this rendition draws on American barbecue flavors and comfort-plate traditions. Spaghetti squash has become popular as a pasta substitute in low-carb and gluten-conscious cooking over the past few decades. Combining it with barbecue—a style rooted in regional American cooking traditions—creates a hybrid that feels both familiar and modern. This dish bridges vegetable-forward cooking and classic backyard flavors in a way that suits contemporary palates.

Seasonal Adaptations

In late summer, use farm-fresh bell peppers and top with corn kernels or grilled cherry tomatoes for a bright finish. In cooler months, add roasted sweet potato cubes or swap the BBQ for a spicier chipotle sauce and top with pickled red onions. Holiday adaptations include adding crumbled cooked bacon and extra sharp cheese for a heartier celebration plate. Adjust herbs seasonally—basil in summer, cilantro or parsley year-round.

Meal Prep Tips

To streamline weeknight assembly, roast several squash halves at once and portion out the strands into meal-sized containers. Cook and shred chicken ahead and mix with BBQ sauce and sautéed veggies; store the filling separately. When ready to eat, combine filling with squash strands, top with cheese, and bake for 10 to 15 minutes. Use shallow airtight containers for easy stacking and quick reheating. Label containers with date and contents for easy rotation.

There’s a simple joy to handing someone their own baked, saucy, cheesy squash boat. It’s comforting, pretty on the plate, and endlessly adaptable—what more could you ask for? Make it yours by swapping sauces, cheeses, and toppings until you find your family’s favorite combination.