Cashew Chicken Casserole (High-Protein & Easy)

I make this cashew chicken casserole in one dish with uncooked quinoa, chicken, peppers, and a savory hoisin-ginger sauce — no separate skillet, no pre-cooked grain, and just one pan to clean. It’s the same easy cashew chicken quinoa bake readers have loved for years, refreshed here with a clearer casserole-first name, a rewritten recipe card, and new step-by-step photos.

This one is Chinese takeout-inspired comfort food, not an attempt at an authentic Chinese recipe — think sweet-savory hoisin sauce, garlic, ginger, and crunchy cashews, all baked together with tender chicken and quinoa. Each serving has 37 grams of protein, so it’s become one of my go-to chicken casserole recipes for busy weeks and easy meal prep.

[Video coming soon — watch how I layer this one-dish cashew chicken casserole.]

Why You’ll Love This Cashew Chicken Casserole

This cashew chicken casserole earns its spot in my regular dinner rotation for a few reasons:

• One-dish dinner: The quinoa, chicken, vegetables, and sauce all bake together in the same casserole dish — no separate skillet or pre-cooked grain required.
• High-protein meal prep: Each serving has 37 grams of protein, and the recipe makes four satisfying portions that hold up well in the fridge.
• Takeout-inspired flavor: Hoisin, tamari or soy sauce, garlic, ginger, and cashews come together for that sweet-savory flavor you’d order from your favorite Chinese takeout spot.
• Flexible vegetables: Bell peppers are my tested base, but I’ve included tested and reader swaps below if you want to change things up.

I love that the pan does the work here, but I still pay close attention to liquid coverage so the quinoa cooks evenly every time.

Featured Ingredients and Smart Swaps

Chicken and quinoa

I use boneless, skinless chicken breast, diced into consistently bite-size pieces, and rinsed, uncooked white quinoa — the same combination that’s made this cashew chicken quinoa bake a reader favorite since it first went up. The chicken goes into the dish raw because it finishes cooking in the oven alongside the quinoa; I don’t recommend swapping in pre-cooked chicken without retesting the bake time.

White quinoa is my tested grain because it cooks predictably in this method. Red quinoa can work, but it often needs more time in the oven, so it isn’t a straight one-to-one timing swap.

The cashew chicken sauce

Hoisin sauce gives the dish its sweet-savory body, while low-sodium soy sauce or tamari adds salt and umami. Fresh garlic and ginger keep the whole thing tasting bright instead of one-note sweet.

For a gluten-free version, use a certified gluten-free tamari and a certified gluten-free hoisin sauce — conventional hoisin and soy sauce can both contain wheat, so it’s worth checking labels rather than assuming. If you want to try a lower-sugar sauce swap, taste-test it before serving, since the liquid and salt balance affects how the quinoa cooks.

Vegetables, cashews, and finishers

Bell peppers and onion are the vegetables I’ve tested most in this recipe. Broccoli florets, cauliflower florets, pea pods, green beans, mushrooms, zucchini, and shelled edamame all work as variations — just keep the total vegetable volume about the same and skip anything especially watery unless you’ve tested it yourself.

I like roasted, salted cashews for the best flavor, and I add them near the end of baking so they stay crisp instead of going soft in the steam. If you or someone you’re serving has a tree-nut allergy, don’t treat another nut or seed as a direct substitute — simply leave the cashews out, or test a seed-based topping on its own before serving it to someone with an allergy. Green onion, sesame seeds, cilantro, and a squeeze of lime all make great optional finishers.

How This One-Dish Cashew Chicken Casserole Works

This cashew chicken casserole comes together in the same dish it bakes in, so here’s the method at a glance — the full ingredient amounts and timing are in the recipe card below.

1. Preheat the oven and coat the casserole dish with cooking spray.
2. Layer the uncooked quinoa, vegetables, and raw, diced chicken in the dish.
3. Whisk the hoisin-ginger sauce and pour it over the top, making sure the quinoa has contact with the liquid.
4. Cover and bake so the quinoa can absorb the sauce and the chicken cooks through, then uncover and add the cashews for the last few minutes.
5. Rest the casserole for 5–10 minutes before serving.

Quinoa needs direct contact with enough hot liquid to hydrate. Dry grains sitting above the sauce line can stay firm even after a full bake, so I always double-check that every bit of quinoa is submerged before the dish goes into the oven. The rest at the end matters just as much: I promise, if it looks a little saucy coming out of the oven, that’s exactly what you want — the 5–10 minute rest is where the magic happens, as carryover heat finishes hydrating the quinoa and thickening the sauce.

I add the cashews near the end of baking for the same reason — steam softens them if they go in too early, and that final uncovered stretch keeps them crunchy. In my testing, the two checks that matter most are using rinsed white quinoa and making sure every grain has contact with liquid before the dish goes into the oven. Always confirm the chicken reaches 165°F in the thickest pieces with an instant-read thermometer before serving.

Tips for the Best Cashew Chicken Casserole

• Use a 9×13-inch casserole dish — a very different size or shape changes the liquid depth and how evenly the quinoa cooks.
• Don’t skip covering the dish for the first part of baking; it traps the steam the quinoa needs to hydrate.
• Spread the quinoa in an even layer and make sure it’s covered by the sauce and water before it goes into the oven.
• Cut the chicken and vegetables into similar bite-size pieces so everything finishes cooking at the same time.
• Rest the finished casserole 5–10 minutes before serving — this is the single most important step for getting the texture right. The quinoa keeps absorbing liquid and the sauce keeps thickening the whole time it rests.

Serving Suggestions

I usually serve this casserole straight out of the dish with a scattering of green onion and sesame seeds on top. A squeeze of fresh lime and a handful of cilantro brighten it up if I have them on hand, and a side of steamed broccoli or a simple cucumber salad rounds out the meal without any extra cooking.

Make Ahead, Storage, and Reheating

The most reliable make-ahead route is baking the casserole first, cooling it promptly, and portioning it into sealed containers — I haven’t tested assembling it raw and refrigerating it overnight, so I can’t recommend that shortcut yet.

• Refrigerator: Store in airtight containers for 3–4 days.
• Freezer: Freeze cooled portions in airtight, freezer-safe containers for up to 3 months. Thaw overnight in the refrigerator before reheating.
• Reheat: Add a small splash of water if the quinoa has tightened up, cover to retain moisture, and heat until it’s hot all the way through — 165°F if you’re checking with a thermometer.

I portion leftovers right away so this casserole is ready for quick lunches as part of my chicken meal prep recipes rotation, rather than becoming another container at the back of the fridge.

More High-Protein Quinoa Dinners

If you like a protein-forward quinoa dinner that makes excellent leftovers, try one of these next:

Dinner served — high protein, one dish, zero regrets.