Zucchini, Tomato & Bell Pepper Gratin

A colorful medley of zucchini, cherry tomatoes, and sweet bell peppers baked under a golden, crispy breadcrumb topping with hints of garlic and fresh basil for a rustic, comforting side dish. This vegetable gratin captures the essence of summer produce with a savory, satisfying finish.

Why You’ll Love This Recipe

This gratin is as easy to make as it is delightful to eat. It transforms fresh vegetables into a warm, flavorful bake with minimal effort. The crunchy Parmesan-breadcrumb topping adds texture and a hint of richness, while the garlic and basil infuse the dish with classic Mediterranean flavors. Whether served as a side or a light vegetarian main, this recipe is hearty, wholesome, and beautifully aromatic.

Ingredients

(Tip: You can find the complete list of ingredients and their measurements in the recipe card below.)

  • 2 medium zucchinis, sliced into 1/4-inch rounds
  • 1 cup cherry tomatoes
  • 1 large yellow bell pepper, cut into chunks
  • 2 tablespoons olive oil
  • 2 cloves garlic, minced
  • 1/2 teaspoon salt
  • 1/2 teaspoon freshly ground black pepper
  • 1/2 cup breadcrumbs
  • 1/4 cup grated Parmesan cheese
  • 2 tablespoons fresh basil leaves, plus more for garnish

Directions

  1. Preheat oven to 375°F (190°C).
  2. In a large bowl, toss the zucchini, cherry tomatoes, and bell pepper with olive oil, minced garlic, salt, and pepper.
  3. Arrange the vegetables in a lightly greased baking dish in an even layer.
  4. In a small bowl, mix the breadcrumbs and Parmesan cheese together. Sprinkle evenly over the vegetables.
  5. Bake for 25–30 minutes, or until the topping is golden brown and the vegetables are tender.
  6. Garnish with additional fresh basil leaves before serving.

Servings and timing

This recipe serves 4 as a side dish.
Prep Time: 10 minutes
Cook Time: 30 minutes
Total Time: 40 minutes

Variations

  • Add protein: Mix in white beans or chickpeas for a more filling vegetarian main.
  • Use different cheese: Swap Parmesan for crumbled feta, goat cheese, or Gruyère.
  • Include more vegetables: Add sliced mushrooms, red onions, or eggplant for variety.
  • Make it spicy: Add a pinch of chili flakes or diced jalapeño for a gentle kick.
  • Use panko: Substitute regular breadcrumbs with panko for extra crunch.

Storage/Reheating

Storage:
Store leftovers in an airtight container in the refrigerator for up to 3 days.

Reheating:
Reheat in a 350°F (175°C) oven for 10–15 minutes until warmed through and the topping is crisp again. Avoid microwaving, which may soften the topping.

FAQs

Can I prepare this gratin ahead of time?

Yes, you can assemble it in advance and refrigerate until ready to bake. Add the topping just before baking to keep it crisp.

Do I need to peel the zucchini?

No, zucchini skin is tender and edible. Peeling is not necessary.

Can I use other types of bell pepper?

Yes, red or orange bell peppers work just as well and add sweetness and color.

Is this dish gluten-free?

It can be made gluten-free by using gluten-free breadcrumbs.

Can I make it vegan?

Yes, use plant-based Parmesan or omit the cheese entirely.

What kind of breadcrumbs should I use?

Plain or seasoned breadcrumbs work well. Panko will give a crunchier texture.

Can I use dried basil instead of fresh?

Fresh basil is preferred, but you can substitute with 1 teaspoon of dried basil if needed.

How can I prevent the vegetables from getting watery?

Ensure vegetables are evenly spaced and not overcrowded, which helps prevent steaming.

What should I serve this with?

It pairs well with grilled meats, pasta, or as part of a vegetarian platter with grains or legumes.

Can I freeze this dish?

Freezing is not recommended, as the vegetables may lose texture and the topping may become soggy upon reheating.

Conclusion

Zucchini, Tomato & Bell Pepper Gratin is a simple yet flavorful way to showcase seasonal vegetables in a comforting, oven-baked dish. With its crunchy topping and herbaceous aroma, it’s sure to become a favorite for weeknight dinners, holiday spreads, or potluck gatherings. Versatile, easy to prepare, and packed with vibrant flavors, this gratin is a delicious celebration of fresh ingredients.

Print
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Zucchini, Tomato & Bell Pepper Gratin

Zucchini, Tomato & Bell Pepper Gratin

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  • Author: Emma Delaney
  • Prep Time: 15 minutes
  • Cook Time: 30 minutes
  • Total Time: 45 minutes
  • Yield: 4 servings 1x
  • Category: Side Dish
  • Method: Baking
  • Cuisine: Mediterranean
  • Diet: Vegetarian

Description

A colorful medley of zucchini, cherry tomatoes, and sweet bell peppers baked under a golden, crispy breadcrumb topping with hints of garlic and fresh basil for a rustic, comforting side dish.


Ingredients

Units Scale
  • 2 medium zucchinis, sliced into 1/4-inch rounds
  • 1 cup cherry tomatoes
  • 1 large yellow bell pepper, cut into chunks
  • 2 tablespoons olive oil
  • 2 cloves garlic, minced
  • 1/2 teaspoon salt
  • 1/2 teaspoon freshly ground black pepper
  • 1/2 cup breadcrumbs
  • 1/4 cup grated Parmesan cheese
  • 2 tablespoons fresh basil leaves, plus more for garnish

Instructions

  1. Preheat oven to 375°F (190°C).
  2. In a large bowl, toss zucchini, cherry tomatoes, and bell pepper with olive oil, garlic, salt, and pepper.
  3. Arrange the vegetables in a lightly greased baking dish.
  4. In a small bowl, mix breadcrumbs and Parmesan cheese. Sprinkle evenly over the vegetables.
  5. Bake for 25–30 minutes, or until the topping is golden and vegetables are tender.
  6. Garnish with fresh basil leaves before serving.

Notes

  • Use panko for a crispier topping.
  • Add red pepper flakes for a spicy kick.
  • Pairs well with grilled chicken or fish.

Nutrition

  • Serving Size: 1 portion (1/4 of recipe)
  • Calories: 180
  • Sugar: 5g
  • Sodium: 330mg
  • Fat: 11g
  • Saturated Fat: 3g
  • Unsaturated Fat: 7g
  • Trans Fat: 0g
  • Carbohydrates: 15g
  • Fiber: 3g
  • Protein: 5g
  • Cholesterol: 5mg

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