This cozy casserole is the kind of meal that brings everyone to the table.
Warm, creamy, and full of simple ingredients, it’s comfort food you can feel good about.
When the mushrooms, onions, and broccoli hit the pan, the kitchen fills with the most delicious, savory aroma.
And once everything bakes together under that silky dairy-free Alfredo sauce—pure magic.
Your family will love how hearty and flavorful it is, and you’ll love that it stays fully Whole30.
It’s an easy weeknight dinner that feels just as rewarding as a Sunday cook-up.
For the Casserole
- Shredded Chicken – You’ll need 4 cups of cooked, shredded chicken. It forms the hearty base of the casserole and makes this dish extra satisfying.
- Olive Oil – Used to sauté the vegetables and bring out their flavor.
- Broccoli – Two full heads, broken into bite-size florets. They add color, crunch, and plenty of nutrients.
- Cremini Mushrooms – Ten mushrooms, sliced. These add an earthy depth that works perfectly with the creamy sauce.
- Onion – Half of a small onion, diced. It creates a savory foundation when sautéed with the mushrooms.
- Chicken Broth – One cup, used to loosen the Vegan Alfredo Sauce and help it coat everything thoroughly.
- Vegan Alfredo Sauce – One full recipe. This is what makes the casserole creamy without using dairy.
- Salt & Pepper – Season to taste to bring everything into balance.
- Rosemary – Fresh rosemary for garnish, adding a hint of herbaceous aroma right before serving.
Seriously The Best Chicken & Broccoli Casserole
This casserole brings together tender chicken, vibrant broccoli, and earthy mushrooms, all wrapped in a rich, dairy-free Alfredo-style sauce.
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Servings: 6
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Ingredients
- 4 cups cooked and shredded chicken
- 2 tbsp olive oil
- 2 heads broccoli, florets removed
- 10 cremini mushrooms, sliced
- 1/2 small onion, diced
- 1 cup chicken broth
- 1 recipe Vegan Alfredo Sauce
- Salt and pepper, to taste
- Rosemary, for garnish
Instructions
- Prepare the Vegan Alfredo Sauce first and set it aside. (It can also be prepared a day ahead and refrigerated.)
- Preheat your oven to 400°F.
- Warm the olive oil in a large sauté pan over medium heat. Add the sliced mushrooms and diced onion, cooking for about 3 minutes.
- Add the broccoli florets—cut into bite-size pieces—to the pan and continue cooking for another 3 minutes, or until the broccoli has brightened and softened slightly.
- Spread the shredded chicken evenly across the bottom of a 9×13-inch casserole dish. Layer the sautéed vegetables over the chicken.
- Whisk the chicken broth into the Vegan Alfredo Sauce. Pour this mixture evenly over the casserole, using a spatula to help distribute it if needed.
- Bake for 20–25 minutes, or until the sauce is bubbling and has thickened a bit.
- Add a sprinkle of fresh rosemary before serving, if you like.
- The Vegan Alfredo Sauce requires pre-soaked cashews, so plan ahead when prepping the recipe.
- This casserole keeps well and makes a great meal-prep option.
- Can I use leftover or pre-cooked chicken?
Absolutely! Using shredded rotisserie or leftover chicken makes this recipe even faster. It’s perfect for a quick weeknight dinner, and everything heats evenly without overcooking the chicken.
- What if I only have frozen broccoli?
No problem. Just thaw it and pat it dry really well so the casserole doesn’t get watery. Frozen broccoli works just as well and saves a ton of prep time.
- Can I assemble it ahead of time?
Yes! You can prep the casserole a day ahead and keep it in the fridge until ready to bake. Just add a few extra minutes to the baking time if it’s cold from the fridge.
- How do I store leftovers?
Store in an airtight container in the fridge for 3–4 days. You can also freeze it in portions for up to a few months. Reheat in the oven or microwave, adding a splash of broth if it dries out.
- How do I avoid a soggy casserole?
Drain and dry your veggies well, especially if they’re frozen. If you’ve pre-assembled and chilled it, let it sit at room temp for 20–30 minutes before baking. This helps everything cook evenly and keeps the texture perfect.
