Easy Cheesy Zucchini Bake

This Easy Cheesy Zucchini Bake is a cozy, no-fuss casserole that brings zucchini and yellow squash together with fresh basil, green onion, and two kinds of melty cheese. In about an hour, you’ll have a golden bubbly dish ready to enjoy as a light main, a veggie-packed side, or a simple potluck favorite that everyone will love.

This zucchini bake comes together quickly and bakes up beautifully without any stress. It’s packed with fresh herbs and ooey-gooey cheese, yet it skips complicated steps and fancy ingredients. Using simple pantry spices and easy slicing, this dish is a comforting, lower-carb option that reheats wonderfully—perfect for busy weeknights or meal prepping ahead.

What Makes This Irresistible

In just about an hour, you get a bubbling casserole with a crispy, cheesy top that’s super easy to make and hard not to love. This zucchini bake takes simple summer squash and turns it into something special with minimal effort and big flavor from fresh basil, green onions, and a combination of two cheeses.

• Quick and effortless: A few minutes to prep, then the oven handles the rest—ideal for nights when you want dinner fast or need a last-minute side.
• Loads of flavor from simple ingredients: Fresh basil, a hint of garlic, and a cheesy finish create a rich, savory topping without any fuss.
• Super versatile: Enjoy as a light main dish, a filling vegetarian side, or bring it to potlucks. You can also mix in cooked bacon, sausage, or chicken along with different cheeses to switch things up.
• Make-ahead and leftover friendly: Easily put together in advance or save leftovers. This bake reheats well and tastes great for days.
• Oven-friendly and forgiving: It can handle some extra bake time without drying out, so the timing isn’t super picky.
• Veggie-focused and satisfying: This dish puts zucchini and yellow squash front and center in a tasty, comfort-food way that keeps things light.

Simple, flexible, and reliably delicious—this zucchini bake is one you’ll want to make all summer long.

What You’ll Need

• 2 medium zucchini, sliced or cut into half-moons
• 2 medium yellow squash, sliced or cut into half-moons
• 4 tablespoons fresh basil, chopped
• 2 tablespoons green onion, thinly sliced
• 1/2 teaspoon dried thyme
• 3/4 teaspoon garlic powder
• 1 cup grated mozzarella cheese (divided: 1/2 cup + 1/2 cup)
• 1/2 cup coarsely grated Parmesan, plus some extra for sprinkling
• Salt and freshly ground black pepper, to taste
• Olive oil or non-stick spray for the baking dish

Assemble, Bake, and Finish

1. Preheat oven to 350°F (180°C) and lightly grease an 8″ x 8″ or 8″ x 11″ baking dish with olive oil or non-stick spray.
2. Wash the zucchini and yellow squash.
3. Slice the squash evenly into 1/4″ to 1/2″ thick slices or half-moons so they cook evenly.
4. If the squash slices seem watery, pat them dry with paper towels.
5. Wash and chop the basil and thinly slice the green onions.
6. In a large mixing bowl, combine the sliced squash, chopped basil, sliced green onions, dried thyme, garlic powder, half the mozzarella, and half the Parmesan; season with salt and freshly ground black pepper and toss until the veggies are well coated.
7. Spread the veggie-cheese mixture in an even layer in the prepared baking dish.
8. Bake uncovered for about 25–30 minutes, or until the squash is mostly tender when poked with a fork.
9. Remove the dish from the oven and sprinkle the remaining mozzarella and extra Parmesan over the top.

10. Return the dish to the oven and bake 10–15 more minutes until the cheese is melted, bubbling, and nicely browned.

    

11. Optional: slide the dish under the broiler for 1–2 minutes at the end for a crispier, golden top, watching closely to avoid burning.
12. Let the bake rest for a few minutes before serving.

Tips for Even Cooking and Browning

• Cut your squash slices about 1/4″ to 1/2″ thick so everything cooks evenly and finishes at the same time.
• If your zucchini feels watery, pat the slices dry with paper towels before mixing to keep the bake from getting soggy.
• Freshly grated mozzarella and Parmesan cheeses melt and brown better than pre-shredded bags that have anti-caking ingredients.
• Test the bake’s doneness by poking a thicker piece of squash with a fork—it should be tender but not mushy.
• For a golden, crispier top, slide the dish under the broiler for 1–2 minutes at the end. Keep an eye on it to stop it before it burns.

Mix-Ins, Swaps, and Upgrades

• Add-ins: For a boost of protein, stir in cooked crumbled bacon, Italian sausage, or diced cooked chicken before baking.
• Veggie swaps: Toss in some sliced tomatoes, bell peppers, or thinly sliced onion to add even more color and flavor.
• Cheese swaps: Try Gruyère, sharp cheddar, or a combo of provolone and Parmesan instead of or alongside your mozzarella for different textures and tastes.
• Herb swaps: Mix in oregano, thyme, or a sprinkle of red pepper flakes if you want to change up the flavor profile.

Storing, Freezing, and Reheating

• Refrigerator: Keep any leftovers covered in an airtight container for 3–4 days. Reheat individual servings in the microwave, or warm the whole casserole in a 350°F (180°C) oven for 15–20 minutes until hot.
• Freezing: This zucchini bake freezes well for up to 2 months, although the texture might soften a bit. Thaw it overnight in the fridge before reheating to help reduce extra moisture.
• Make-ahead: You can put the entire dish together a day before baking, cover it tightly, and refrigerate. When you’re ready, bake it chilled—just add a few extra minutes to the baking time.

Answers to Common Questions

• Can I use just zucchini or just yellow squash? Absolutely! Both work well on their own. Using both just adds a nice mix of color and textures, but the cooking process stays the same.
• Should I pre-salt the squash? You don’t have to, but if your squash feels watery, sprinkling some salt on the slices and letting them sit for 10–15 minutes before patting dry can help keep the casserole from being soggy.
• Can I make this dairy-free? Yes! Use dairy-free shredded cheeses and either leave out the Parmesan or substitute it with a plant-based alternative. Expect the texture and taste to be a bit different but still tasty.
• How do I avoid a soggy zucchini bake? Slice the squash evenly, don’t crowd the dish, pat very wet squash dry, and make sure you bake until the extra moisture bubbles off and the edges turn golden.
• Can I double this recipe? You sure can! Just use a bigger baking dish and expect a longer bake time. Keep an eye on the squash tenderness and the cheese browning as it bakes.