This healthy zucchini slice is one of those recipes that can fit into almost any part of your day. Serve it for breakfast, enjoy it as a light lunch, have it with dinner, or pack a slice as an easy snack. It tastes delicious when served warm from the oven, but it is also great cold the next day, which makes it a handy option for meal prep and lunchboxes.

The preparation is also very simple. Unlike complicated casseroles that require several layers and separate cooking steps, most of the ingredients for this zucchini slice come together in one bowl before going into the oven. With very little effort, you get a golden, cheesy bake filled with vegetables, eggs, and plenty of flavor.

Why You’ll Love This Recipe

There are so many reasons this healthy zucchini slice can become a regular favorite in your kitchen.

Ready in under 1 hour
Filled with fresh vegetables
High in protein
Excellent for meal prep
Suitable for breakfast, lunch, or dinner
Easy to change with different ingredients
Budget-friendly
Family-friendly
Freezer-friendly
Delicious both warm and cold

Each slice combines colorful vegetables with creamy cheese and fluffy eggs, making it a satisfying meal that is easy to enjoy at any time of the day.

Ingredients

This recipe makes 12 slices.

Main Ingredients

2 tablespoons olive oil
1 medium onion, finely diced
1 medium zucchini (about 220 g), grated
2 cups broccoli florets, finely chopped
2 cups baby spinach, roughly chopped
1 garlic clove, minced
5 large eggs
1 teaspoon Dijon mustard
1 teaspoon salt
½ teaspoon freshly ground black pepper
1 cup self-rising flour
(If using all-purpose flour, add 1 teaspoon baking powder.)
200 g low-fat cottage cheese
115 g grated cheddar cheese
½ cup frozen peas
2 tablespoons olive oil (for the batter)

Kitchen Equipment

Before you begin, gather the following:

Large mixing bowl
Frying pan
Whisk
Wooden spoon
Box grater
Baking dish (approximately 7 × 12 inches)
Baking paper
Sharp knife

Recipe Information

Preparation Time: 20 minutes
Cooking Time: 35 minutes
Total Time: 55 minutes
Servings: 12 slices
Calories: Approximately 175 per slice

Step-by-Step Instructions

Step 1: Get the Oven Ready

Start by preheating your oven to 355°F (180°C).

Lightly grease a baking dish with oil or cooking spray.

Line the dish with baking paper, allowing some paper to hang over the sides. This will make it much easier to lift the cooked slice out of the pan later.

Step 2: Cook the Onion

Place 2 tablespoons of olive oil in a frying pan and heat over medium heat.

Add the finely diced onion and cook for around 5–6 minutes. Stir from time to time until the onion becomes soft and lightly golden.

Once cooked, remove the pan from the heat and leave the onion aside to cool while you prepare the other ingredients.

Step 3: Prepare the Vegetables

Wash the vegetables thoroughly before preparing them.

Grate the zucchini using the coarse side of a box grater.

Place the grated zucchini into a clean kitchen towel or cheesecloth. Squeeze it firmly to remove as much excess moisture as possible.

This step is very important because too much moisture can leave the finished zucchini slice watery.

Next, finely chop the broccoli into small pieces.

Roughly chop the baby spinach and mince the garlic.

The frozen peas can be added directly from the freezer, so there is no need to thaw them first.

Step 4: Prepare the Batter

Take a large mixing bowl and whisk together the:

Eggs
Dijon mustard
Salt
Black pepper

Continue whisking until everything is well combined and smooth.

Slowly add the flour while continuing to whisk.

Keep mixing until you have a thick batter without any obvious lumps.

Next, add the cottage cheese and grated cheddar cheese.

Stir well until the cheeses are evenly distributed through the mixture.

Step 5: Mix in the Vegetables

Now it is time to add the prepared vegetables.

Gently fold the following into the batter:

Cooked onion
Garlic
Grated zucchini
Broccoli
Spinach
Frozen peas

Add the remaining olive oil as well.

Stir everything gently until the vegetables are evenly coated with the egg and cheese mixture.

There may seem to be a lot of vegetables compared with the batter, but don’t worry. They will all cook together and form a delicious slice in the oven.

Step 6: Bake the Zucchini Slice

Pour the prepared mixture into your lined baking dish.

Use the back of a spoon or a spatula to spread the mixture evenly across the dish.

Place it in the preheated oven and bake for 35 minutes, or until the top is golden brown and the center feels firm.

To check whether it is ready, insert a knife into the middle of the slice. If the knife comes out clean, the zucchini slice is cooked.

If you want the top to have a little more color and crispness, place it under the broiler for 2–3 minutes.

Keep a close eye on it during this time so the top does not burn.

Step 7: Cool and Cut

Once the zucchini slice is finished baking, remove it from the oven.

Allow it to rest for 5–10 minutes.

Use the overhanging baking paper to carefully lift the slice from the dish and transfer it to a cutting board.

Cut it into 12 equal portions.

You can serve it warm or allow it to cool to room temperature before serving.

Why These Ingredients Work

Each ingredient has a role in making this zucchini slice flavorful, soft, and satisfying.

Zucchini

Zucchini adds moisture and tenderness to the slice. Its mild flavor also blends easily with the other ingredients.

Broccoli

Broccoli brings extra vegetables and a pleasant texture to each bite.

Spinach

The spinach becomes soft as it cooks and spreads throughout the mixture, adding color and flavor.

Frozen Peas

Frozen peas provide little bursts of sweetness and add a bright green color to the finished slice.

Eggs

Eggs help hold all the ingredients together while giving the slice its light and fluffy texture.

Cottage Cheese

Cottage cheese gives the slice a soft and creamy texture while also contributing protein.

Cheddar Cheese

The grated cheddar melts throughout the mixture and adds a rich, cheesy flavor without taking away from the vegetables.

Dijon Mustard

A small amount of Dijon mustard adds extra depth to the savory flavor of the recipe.

Tips for Perfect Results

1. Remove as Much Zucchini Moisture as Possible

Do not skip squeezing the grated zucchini. Removing the excess water helps prevent the finished slice from becoming too wet.

2. Cook the Onion First

Cooking the onion before adding it to the mixture makes it softer and brings out its natural sweetness.

3. Keep the Vegetable Pieces Similar in Size

Try to chop the vegetables into reasonably even pieces. This helps everything cook more evenly.

4. Avoid Overmixing

Once the vegetables are added, fold them through the batter gently.

Overmixing can make the finished texture heavier.

5. Give It Time to Rest

Allowing the slice to cool for a few minutes after baking helps it firm up and makes cutting much easier.

Delicious Variations

This recipe is easy to adjust depending on what you have available.

Add Feta Cheese

For a Mediterranean-style flavor, replace half of the cheddar cheese with crumbled feta.

Add Fresh Herbs

Fresh parsley, basil, dill, or chives can be added to give the zucchini slice a fresh boost of flavor.

Make It Spicy

If you enjoy a little heat, add some crushed red pepper flakes or finely chopped jalapeños.

Add Extra Protein

For an extra protein option, mix in cooked shredded chicken or diced turkey.

Try Different Vegetables

You can also experiment with other vegetables such as grated carrots, corn, mushrooms, bell peppers, or cauliflower.

Make It Gluten-Free

For a gluten-free version, replace the regular self-rising flour with your preferred gluten-free self-rising flour blend.

Serving Suggestions

This zucchini slice can be served on its own or alongside other foods.

Try serving it with:

Green salad
Tomato salad
Roasted potatoes
Vegetable soup
Grilled chicken
Fresh fruit
Toast
Avocado slices
Greek yogurt
Sour cream

It is also a great choice for lunchboxes and picnic baskets because it can be enjoyed warm, at room temperature, or cold.

Storage Instructions

Let the zucchini slice cool completely before putting it into storage.

Place the portions in an airtight container and refrigerate for up to 4 days.

If you are stacking several slices in the same container, place parchment paper between the layers to prevent them from sticking together.

Freezing Instructions

To freeze the zucchini slice, wrap individual portions tightly in plastic wrap or foil.

Place the wrapped slices into freezer-safe containers.

They can be frozen for up to 3 months.

When you’re ready to eat them, thaw the slices overnight in the refrigerator before reheating.

Reheating

For oven reheating, place the zucchini slice in a 350°F (175°C) oven for around 10 minutes.

You can also warm individual slices in a skillet over medium heat.

A microwave can be used when you want a quicker option. However, keep in mind that microwaving will make the edges softer rather than crisp.

Nutritional Information (Per Slice)

Approximate values:

Calories: 175
Protein: 11 g
Carbohydrates: 10 g
Fat: 10 g
Saturated Fat: 3 g
Fiber: 2 g
Sugar: 2 g
Sodium: 330 mg

Nutritional values are estimates and may vary depending on the brands and exact ingredients used.

Frequently Asked Questions

Can I prepare this ahead of time?

Yes. This zucchini slice is a convenient meal-prep recipe and can be prepared ahead of time. It also tastes great the following day.

Do I need to peel the zucchini?

No, peeling is not necessary. The zucchini skin becomes tender during baking and also adds extra color to the finished dish.

Can I use frozen spinach?

Yes. Frozen spinach works well in this recipe. Make sure to thaw it completely and squeeze out as much excess moisture as possible before adding it.

Can I substitute cottage cheese?

Yes. Ricotta cheese is a suitable alternative and will give the slice a similarly creamy texture.

Why did my zucchini slice turn out watery?

The most common reason is excess moisture in the grated zucchini. Make sure you squeeze the zucchini thoroughly before adding it to the batter.

Can I serve it cold?

Absolutely. This zucchini slice can be served cold straight from the refrigerator, and it is a convenient option for lunchboxes, picnics, and meal prep.