Spinach Quinoa Lasagna Casserole

When lasagna sounds perfect but you want to avoid boiling noodles and washing a pile of pans, this spinach quinoa lasagna casserole is the quick solution. Everything bakes together in one dish—including the uncooked quinoa—so you get all the comfort of lasagna with far less effort. It’s a hearty, protein-rich vegetarian meal that reheats well and works great for weekly meal prep.

What Makes This Recipe Great

Here are the main reasons this casserole is a favorite:

• No pre-cooking: Uncooked quinoa cooks in the casserole, eliminating an extra pot and saving time.
• One-dish dinner: Everything bakes in a single casserole dish for easy preparation and minimal cleanup.
• High-protein and satisfying: Quinoa plus cottage cheese, ricotta, and mozzarella create a filling, protein-forward vegetarian meal.
• Lasagna flavor without the fuss: This “lazy lasagna” gives you cheesy, saucy comfort without boiling or layering noodles.

Ingredients You’ll Need

This simple, wholesome casserole relies on everyday ingredients to deliver a cheesy, vegetable-forward dinner with minimal hands-on time.

• White quinoa: White quinoa cooks softer than red quinoa and soaks up flavor from the sauce and broth as it bakes.
• Vegetables: Bella mushrooms, fresh spinach, and yellow onion add texture, flavor, and nutrients.
• Marinara sauce: Store-bought marinara keeps the recipe quick, though a homemade sauce can be used as well.
• Cheeses: Full-fat ricotta for creaminess, cottage cheese for extra protein and lighter texture, and shredded mozzarella for a melty topping.
• Vegetable broth: Cooking the quinoa in broth gives deeper flavor than water alone.
• Fresh tomatoes: Optional, but recommended for color and brightness when layered on top before finishing with cheese.
• Seasonings: Italian seasoning, garlic powder, salt, and pepper for a classic lasagna profile.

How to Make Quinoa Lasagna

This casserole is straightforward and forgiving. The quinoa cooks right in the dish, absorbing sauce and broth to become tender and flavorful. Follow these steps:

1. Preheat and prep: Preheat the oven to 375ºF (190ºC). Grease a large casserole dish with a spray or a light coating of olive oil.
2. Layer the vegetables and quinoa: Chop the mushrooms and dice the onion. Place mushrooms, spinach, onion, and the uncooked quinoa into the greased casserole dish.
3. Make the marinara mixture: In a bowl, combine marinara sauce, vegetable broth, cottage cheese, ricotta, and seasonings. Stir until smooth.
4. Combine and bake: Pour the marinara mixture over the vegetables and quinoa. Stir to distribute and make sure the quinoa is mostly submerged. Cover tightly with foil and bake for 30 minutes.
5. Stir and continue baking: Remove the foil, stir the casserole (it may be soupy—that’s normal), re-cover, and bake another 30 minutes until the quinoa is tender and has absorbed most of the liquid.
6. Add toppings and melt: Top with sliced tomatoes and shredded mozzarella. Return to the oven just long enough for the cheese to melt, about 2 minutes.
7. Rest before serving: Let the casserole sit 10 minutes; it will thicken and set, making it easy to scoop and serve.

Easy Swaps & Add-Ins

This casserole adapts easily to what you have on hand. Try one of the following changes to customize flavor and texture:

• Vegetable swaps: Use zucchini, bell peppers, or eggplant in place of or in addition to mushrooms.
• Extra protein: Stir in a cup of drained black beans for added heft and fiber.
• Frozen spinach: Thaw and squeeze out excess liquid before using.
• Red quinoa: Swap for a firmer, nuttier texture if you prefer.
• Cheese variations: Try fresh mozzarella or a sprinkle of Parmesan on top for more richness.
• Lighter option: Use more cottage cheese and less ricotta for a lower-fat version that still stays creamy.
• Seasoning boosts: Add dried oregano or a couple of minced garlic cloves for a stronger savory note.
• Fresh finish: Garnish with fresh basil or an extra spoonful of marinara after baking.

Images below show the casserole as it bakes and after it is finished.

Serving Suggestions

This casserole is filling on its own, but a simple side can make the meal feel complete. Favorite pairings include:

• Simple green salad: Mixed greens or arugula with a light vinaigrette to cut the richness.
• Garlic bread or toasted baguette: Crunchy bread is great for mopping up extra sauce.
• Roasted vegetables: Extra roasted zucchini, broccoli, or carrots for more variety and color.
• A glass of red wine: A light red like pinot noir or a simple Chianti complements the tomato and herb notes.

How to Store & Freeze

This casserole stores and freezes very well—one reason it’s ideal for meal prep. Cool completely, then transfer leftovers to an airtight container and refrigerate for up to 5 days.

To freeze, bake in an oven-safe disposable or aluminum dish. After cooling, press plastic wrap over the surface to eliminate as much air as possible, then wrap tightly in foil. Freeze up to 3 months. Thaw in the fridge before reheating. Reheat in a 400ºF oven until warmed through (about 20 minutes) or microwave single portions for quick lunches.

More Quinoa Casserole Ideas

• Chicken Apple Sausage Quinoa Casserole
• Chicken Cacciatore Quinoa Bake
• Mexican Sweet Potato Quinoa Casserole
• Sweet Potato Green Curry Quinoa Casserole

Recipe

Spinach Quinoa Lasagna Casserole

This one-dish spinach quinoa lasagna casserole combines uncooked quinoa with marinara, vegetables, and three cheeses for a lighter, gluten-free take on classic lasagna. It’s perfect for weeknights and meal prep.

By: Lee Funke

Prep: 10 mins • Cook: 1 hr • Total: 1 hr 10 mins • Servings: 6

Ingredients

Instructions

1. Preheat the oven to 375ºF and grease a large casserole dish with cooking spray or a light coating of oil.
2. Chop the mushrooms and finely dice the onion. Place the mushrooms, spinach, and onion into the greased casserole dish.
3. Add the quinoa to the casserole dish and set aside.
4. In a medium bowl, combine the marinara sauce, vegetable broth, cottage cheese, ricotta, Italian seasoning, garlic powder, salt, and pepper. Mix until evenly combined.
5. Pour the marinara mixture over the vegetables and quinoa. Stir so the quinoa is mostly submerged and ingredients are well distributed.
6. Cover the dish with aluminum foil and bake for 30 minutes.
7. Remove the foil and stir. The casserole will look soupy at this point; that’s expected because the quinoa is still absorbing liquid.
8. Re-cover and bake another 30 minutes, until the quinoa is tender and most of the liquid is absorbed.
9. Remove from the oven, top with sliced tomatoes and shredded mozzarella, and return to the oven just long enough for the cheese to melt (about 2 minutes).
10. Let the casserole rest for 10 minutes before serving. Garnish with fresh basil if desired.

Tips & Notes

• Rinse quinoa under cold water before using to remove naturally occurring saponins that can taste slightly bitter.
• This casserole contains dairy and some cholesterol, but it’s generally lighter than traditional meat-based lasagna.
• Low-and-slow baking helps the quinoa fully absorb the marinara and broth for a creamy, lasagna-like texture—avoid very high heat.

Nutrition (approx. per serving)

• Calories: 401 kcal
• Carbohydrates: 45 g
• Protein: 22 g
• Fat: 15 g
• Fiber: 6 g
• Sugar: 10 g

Nutrition information is an approximation.

Photography by: The Wooden Skillet