5-Ingredient Vegan Baked Polenta and Zucchini Casserole

Mia 2025-07-12

0 44 5 minutes read

Some nights, I want a dinner that feels like a warm hug but doesn’t require me to dirty every pot in the kitchen. This 5-Ingredient Vegan Baked Polenta and Zucchini Casserole is exactly that kind of meal. It’s creamy, comforting, and layered with summer-fresh zucchini and rich marinara, all topped with a golden, cheesy crust minus the dairy.

The best part? You only need five core ingredients. No complicated sauces, no hard-to-find vegan cheeses, no fuss. The polenta creates the dreamiest, creamiest base, while the zucchini adds freshness and a bit of texture. And when you slice into it and see those gorgeous layers? Trust me, it looks far more complicated than it actually is. Whether you’re feeding a hungry family or meal-prepping for the week, this casserole is about to become a staple in your rotation.

Recipe Overview

Prep Time: 15 minutes
Cook Time: 45–50 minutes
Total Time: 60–65 minutes
Servings: 6
Cuisine: Italian-Inspired
Course: Main Dish
Calories (Approximate): 250 per serving

Why You’ll Love This Recipe

Only 5 Core Ingredients: Minimal shopping list, maximum flavor.
Naturally Vegan & Gluten-Free: Perfect for various dietary needs without sacrificing comfort.
Creamy & Comforting: The polenta bakes into a silky, satisfying base that’s pure comfort food.
Meal Prep Hero: Slices and stores beautifully, making it ideal for weekly meal prep.
Budget-Friendly: Simple, affordable ingredients come together into a meal that feels anything but basic.

Ingredients

1 cup dry polenta (or coarse cornmeal)
4 cups vegetable broth
2 medium zucchinis, sliced into thin rounds
2 cups marinara sauce (your favorite jarred or homemade)
1 cup vegan shredded cheese (mozzarella or Italian blend)
Optional: Fresh basil, salt, pepper, and a drizzle of olive oil for serving

Ingredient Notes

Polenta: Coarse cornmeal or traditional polenta works best. Instant polenta is a time-saver if you’re short on time, but traditional gives a creamier texture. Whisk constantly to avoid lumps.

Zucchini: Slice it thin and uniform so it cooks evenly. If your zucchini is large and watery, salt the slices for 10 minutes and pat them dry before layering to prevent a soggy casserole.

Marinara Sauce: Use a high-quality jarred marinara or homemade. A good sauce makes all the difference in a 5-ingredient recipe.

Vegan Cheese: A good melting vegan mozzarella or Italian blend works beautifully. If you prefer, you can also make a simple cashew cream for a homemade cheesy topping.

Step-by-Step Instructions

1. Cook the Polenta

Bring the vegetable broth to a boil in a large saucepan. Slowly whisk in the dry polenta, stirring constantly to prevent lumps. Reduce the heat to low and cook for 15–20 minutes, stirring frequently, until thick and creamy. Season with salt and pepper.

2. Preheat and Prepare

Preheat your oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish with olive oil or cooking spray.

3. Layer the Base

Spread half of the cooked polenta evenly into the bottom of the baking dish.

4. Add Zucchini and Sauce

Arrange half of the zucchini slices over the polenta. Spread 1 cup of marinara sauce over the zucchini. Sprinkle with half of the vegan cheese.

5. Repeat the Layers

Add the remaining polenta, spreading it evenly. Top with the remaining zucchini slices, marinara, and vegan cheese.

6. Bake

Cover with foil and bake for 30 minutes. Remove the foil and bake for another 15–20 minutes, until the top is golden, bubbly, and slightly crispy.

7. Rest and Serve

Let the casserole rest for 5–10 minutes before serving. Garnish with fresh basil and a drizzle of olive oil.

Expert Tips

Whisk Constantly: This is the key to smooth polenta. Lumps form quickly if you don’t keep stirring.
Salt Your Zucchini: If your zucchini is watery, salting and patting dry is a must to avoid a soggy casserole.
Let It Rest: Resting allows the layers to set, making it easier to slice and serve.
Broil for Extra Golden: For a crispier top, broil for the last 2–3 minutes, watching closely.

Variations

Eggplant Version: Swap the zucchini for thinly sliced eggplant.
Spicy Arrabbiata: Use spicy marinara and add red pepper flakes for heat.
Mushroom Polenta: Sauté mushrooms and layer them with the zucchini.
Cashew Cheese: Blend soaked cashews with nutritional yeast, lemon, and garlic for a homemade cheesy topping.

Storage Instructions

Store leftovers in an airtight container in the refrigerator for up to 4 days. The casserole can also be frozen for up to 2 months.

Reheating Tips

Reheat individual slices in the microwave for 1–2 minutes, or in a 350°F oven for 10–15 minutes to restore the crispy top.

Common Mistakes to Avoid

Lumpy Polenta: Whisk constantly and add polenta slowly.
Soggy Casserole: Salt and dry your zucchini, and don’t skip the foil-free baking time.
Bland Flavor: Season the polenta well and use a good quality marinara.
Underbaking: The casserole should be bubbly and golden on top.

What to Serve With

Garlic Bread: The perfect side for soaking up extra sauce.
Green Salad: A simple salad with balsamic vinaigrette balances the richness.
Roasted Vegetables: Add a side of roasted broccoli or asparagus.
Crusty Bread: Simple and satisfying.

Frequently Asked Questions

Q: Can I use instant polenta?
A: Yes, instant polenta works and cooks much faster. Follow the package directions and adjust the liquid accordingly.

Q: Is this casserole gluten-free?
A: Yes, polenta is naturally gluten-free, and the other ingredients are too, as long as your vegan cheese and marinara are gluten-free.

Q: Can I make this ahead of time?
A: Yes! Assemble the casserole, cover, and refrigerate for up to 24 hours. Add 10 minutes to the baking time.

Q: How do I make it cheesier?
A: Add extra vegan cheese or a drizzle of cashew cream between layers.

Q: Can I use fresh tomatoes instead of marinara?
A: Yes, but you’ll want to cook them down with garlic and herbs first to concentrate the flavor.

Q: What if I don’t have vegan cheese?
A: You can make a simple cashew cream or use a drizzle of olive oil and nutritional yeast.

Conclusion

This 5-Ingredient Vegan Baked Polenta and Zucchini Casserole is proof that simple ingredients can create something truly special. It’s creamy, comforting, and layered with flavor, all while being completely plant-based. Whether you’re new to vegan cooking or a seasoned pro, this recipe is sure to become a favorite.

So go ahead—grab those five ingredients, preheat your oven, and get ready to enjoy a casserole that’s as satisfying as it is simple.

Have you tried this Polenta and Zucchini Casserole? I’d love to hear how it turned out! Share your photos, tips, and any creative variations in the comments below. Happy cooking!

Enjoy your delicious, easy vegan casserole!

For more general food safety and nutrition guidance, see the Harvard T.H. Chan School of Public Health.