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This broccoli quinoa casserole blends roasted broccoli and fluffy quinoa in a creamy cheddar sauce, topped with golden breadcrumbs. It bakes in under 45 minutes, making it a hearty side or main.
A creamy, textured casserole bubbling with tender broccoli and fluffy quinoa in under an hour.
Steaming broccoli releases its earthy aroma while preserving a slight crunch that contrasts with fluffy quinoa after baking. A smooth cheese sauce binds everything together, its gentle tang balancing hearty vegetables and grains.
Slow baking at 350 degrees allows the casserole edges to develop a golden crust while the interior stays moist and rich. Toasted breadcrumbs provide a crisp top layer that enhances texture and adds a nutty flavor.
Incorporating lemon zest into the sauce brightens the dish and cuts through creaminess, enriching its complexity. Roasting the broccoli before mixing deepens caramelized notes that elevate this casserole beyond a simple bake.
Recipe Overview
Why This Recipe Works
Here’s why this broccoli quinoa casserole stands out from other baked dishes.
Why We Love It
- Combines complete plant-based protein from quinoa with green veggies for satisfying nutrition.
- Offers a gluten-free option by using gluten-free breadcrumbs or omitting them.
- Uses shredded sharp cheddar for a balanced cheese flavor without overpowering.
- Easy to tweak with assorted vegetables like mushrooms or cauliflower for variety.
- Bakes into a dish that can be sliced neatly, excellent for meal prep portions.
Shop the tools used in this recipe
- Baking dish (9×9 inch)
- Medium saucepan
- Large skillet
- Mixing bowls
- Whisk
- Measuring cups and spoons
- Wooden spoon
- Oven mitts
Key Ingredients
Quinoa’s ability to absorb sauce without becoming mushy makes it ideal here, while broccoli’s florets retain texture after roasting, preventing sogginess in the casserole.
Core ingredients combine grains, vegetables, cheese, and seasonings to build this hearty casserole.
- For the Base
- 1 cup quinoa, rinsed
- 2 cups vegetable broth
- 3 cups broccoli florets, chopped
- 1 medium onion, diced
- For the Sauce
- 2 tablespoons butter
- 2 tablespoons all-purpose flour
- 1 1/2 cups milk
- 1 teaspoon lemon zest
- 1/4 teaspoon ground nutmeg
- 1 1/2 cups sharp cheddar cheese, shredded
- For Topping
- 1/2 cup gluten-free breadcrumbs
- 2 tablespoons grated Parmesan cheese
- 1 tablespoon olive oil
- Salt and black pepper to taste
Equipment Needed
Step-by-Step Instructions
Follow these steps carefully to prepare and assemble the casserole for even cooking and texture.
Pro Tip
Press the casserole firmly into the baking dish to compact ingredients evenly, which helps the casserole hold its shape when sliced.
Success Tips
- Rinse quinoa well to remove natural bitterness before cooking.
- Roast broccoli separately to retain its structure and avoid soggy casserole.
- Add a pinch of nutmeg to the cheese sauce to deepen flavor subtly.
- Allow the casserole to cool slightly before serving for cleaner slices.
- Use a mix of cheeses for layered flavor, such as sharp cheddar with Gruyère.
- Don’t omit pressing the mixture firmly to maintain shape after baking.
Try these ingredient alternatives if needed or to change flavor profiles.
Substitutions
- Swap broccoli for cauliflower or sautéed kale for texture variation.
- Replace cheddar with mozzarella or Monterey Jack for a milder taste.
- Use almond or oat milk to make the sauce dairy-free.
- Substitute vegetable broth with chicken broth if not vegetarian.
- Use panko breadcrumbs instead of regular for a crunchier topping.
- Replace butter with olive oil for a lighter sauce base.
Frequently Asked Questions
Q: Can I freeze this?
A: Yes, for up to 3 months.
Here are practical ways to store leftovers safely and preserve taste.
Storage and Reheating
- Cool completely before transferring leftovers to an airtight container.
- Refrigerate for up to 4 days; reheat covered in the oven at 325 degrees until warmed through.
- Freeze in portions for up to 2 months; thaw overnight in the fridge before reheating.
- Keep the breadcrumb topping separate when freezing to retain crispness upon reheating.
These dishes complement the casserole’s flavors and round out a meal well.
What to Serve With It
- Simple mixed green salad with vinaigrette to cut richness.
- Roasted chicken thighs for adding protein and heartiness.
- Steamed green beans tossed in lemon butter to echo flavors.
- Crisp apple slices add fresh sweetness contrast on the side.
Broccoli Quinoa Casserole
Ingredients
- For the Base
- ☐ 1 cup quinoa, rinsed
- ☐ 2 cups vegetable broth
- ☐ 3 cups broccoli florets, chopped
- ☐ 1 medium onion, diced
- For the Sauce
- ☐ 2 tablespoons butter
- ☐ 2 tablespoons all-purpose flour
- ☐ 1 1/2 cups milk
- ☐ 1 teaspoon lemon zest
- ☐ 1/4 teaspoon ground nutmeg
- ☐ 1 1/2 cups sharp cheddar cheese, shredded
- For Topping
- ☐ 1/2 cup gluten-free breadcrumbs
- ☐ 2 tablespoons grated Parmesan cheese
- ☐ 1 tablespoon olive oil
- ☐ Salt and black pepper to taste
Instructions
- 1 Preheat oven to 350 degrees Fahrenheit and lightly grease a 9×9 inch baking dish.
- 2 Cook quinoa in vegetable broth over medium heat until liquid is absorbed, about 15 minutes, then fluff with a fork.
- 3 While quinoa cooks, roast broccoli on a baking sheet with a drizzle of olive oil and salt at 400 degrees for 15 minutes until edges begin to brown.
- 4 In a skillet, melt butter over medium heat; whisk in flour and cook for 1 minute until bubbling without browning.
- 5 Gradually add milk, whisking constantly until sauce thickens and coats the back of a spoon, about 5 minutes; stir in lemon zest, nutmeg, and half the cheddar cheese until melted.
- 6 Combine cooked quinoa, roasted broccoli, sautéed onions, and cheese sauce in a large bowl; season with salt and pepper.
- 7 Transfer mixture to the prepared baking dish, pressing down gently to compact evenly.
- 8 In a small bowl, mix breadcrumbs, Parmesan, and olive oil; sprinkle evenly over casserole surface.
- 9 Bake uncovered for 25-30 minutes until the top is golden and bubbling around edges.
- 10 Remove from oven and let sit for 5 minutes to set before slicing and serving.
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