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Skillet Zucchini Gratin: A Cheesy, Golden Delight

Tender zucchini and onions meld in a bubbling cheese blanket, perfumed with Italian herbs.

Janelle

By Janelle

Updated: January 18, 2026

Why I Love This Recipe

This Cheesy Zucchini Skillet isn't just another side dish; it's a celebration of simple ingredients transformed into something truly special. Think of it as a rustic, deconstructed zucchini gratin, perfect for a casual weeknight dinner or a potluck gathering. The beauty lies in its ease of preparation and the incredible depth of flavor achieved by slowly caramelizing the vegetables and letting the cheese form a golden-brown crust. It's a dish that speaks of comfort, abundance, and the joy of sharing good food.

  • •Silky-soft zucchini - Slow cooking makes the zucchini incredibly tender, almost melting in your mouth.
  • •Caramelized onion sweetness - The onions are cooked until deeply golden, adding a subtle sweetness that balances the richness of the cheese.
  • •Herbaceous aroma - Italian seasoning infuses the dish with a warm, inviting fragrance.
  • •Cheesy, bubbly goodness - The combination of mozzarella and Parmesan creates a wonderfully gooey and flavorful topping.
  • •Effortless elegance - It's easy enough for a weeknight meal but impressive enough to serve to guests.

Ingredients You'll Need

Here's what you'll need – nothing too fancy, just good ingredients that work together beautifully.

  • 2 medium Zucchini (sliced into 1/4-inch rounds)
  • 1 medium Yellow Onion (thinly sliced)
  • 2 cloves Garlic (minced)
  • 2 tablespoons Olive Oil
  • 1 teaspoon Italian Seasoning
  • 1/2 teaspoon Salt
  • 1/4 teaspoon Black Pepper
  • 1 1/2 cups Shredded Mozzarella Cheese
  • 1/4 cup Grated Parmesan Cheese
  • 2 tablespoons Fresh Basil (chopped, for garnish)

Step-by-Step Instructions

  1. 1

    Heat the olive oil in a large oven-safe skillet (cast iron is ideal) over medium heat. Ensure the skillet is hot before adding the vegetables; this will help them caramelize properly.

    ~2 min

  2. 2

    Add the sliced onion to the skillet and cook, stirring occasionally, until softened and golden brown. This should take about 8-10 minutes. The onions should be fragrant and slightly sweet.

    ~8 min

  3. 3

    Add the minced garlic to the skillet and cook for another minute, until fragrant. Be careful not to burn the garlic, as it will become bitter. The aroma should be strong and savory.

    ~1 min

  4. 4

    Add the zucchini slices to the skillet and season with Italian seasoning, salt, and black pepper. Stir to combine, ensuring the zucchini is evenly coated with the oil and spices.

    ~2 min

  5. 5

    Cook the zucchini, stirring occasionally, until it is tender and slightly browned, about 10-12 minutes. The zucchini should soften significantly and release some of its moisture.

    ~10 min

  6. 6

    Remove the skillet from the heat. Spread the shredded mozzarella cheese evenly over the zucchini mixture.

    ~1 min

  7. 7

    Sprinkle the grated Parmesan cheese over the mozzarella cheese. This will add a salty, nutty flavor and help the cheese brown beautifully.

    ~1 min

  8. 8

    Place the skillet under the broiler for 3-5 minutes, or until the cheese is melted and bubbly and lightly golden brown. Watch carefully to prevent burning.

    ~4 min

  9. 9

    Remove the skillet from the broiler and let it cool slightly for a few minutes before serving. This will allow the cheese to set a bit and prevent it from being too runny.

    ~3 min

  10. 10

    Garnish with fresh chopped basil before serving. The fresh basil adds a bright, herbaceous note that complements the richness of the cheese and vegetables.

    ~1 min

How Do I Know It's Ready?

The zucchini is done when it's tender and slightly translucent. The cheese should be melted, bubbly, and lightly golden brown.

Frequently Asked Questions

Yes, bell peppers, mushrooms, or cherry tomatoes would be great additions. Add them along with the zucchini.

Final Thoughts

I hope you enjoy making this Skillet Zucchini Gratin: A Cheesy, Golden Delight as much as I do! It's a wonderful dish that's sure to become a favorite in your kitchen. If you try this recipe, I'd love to hear how it turned out – feel free to share your experience and any variations you tried!