These zucchini brownies are unbelievably moist, tender, and packed with rich chocolate flavor. Seriously, no one will ever guess that the secret ingredient making them so fudgy is ordinary zucchini! In my experience, this is the only way my kids will happily eat zucchini again and again, always asking for seconds. I think it's an excellent alternative to traditional brownies, especially if you're vegetarian, observing a fast, and a fantastic option if you're looking for a delicious egg-free treat.

This is the simplest brownie recipe I know. I'm confident that anyone can make it. The key to their incredible moisture? Using fresh, juicy zucchini is essential as they provide the primary liquid for the batter.

Prep Time
Cook Time
Total Time
 
Servings: 9 servings

Ingredients for 9 portions

Ingredients for Zucchini Brownies
  • 3 cup Zucchini (500 g)
  • 1/2 cup Vegetable oil (120 ml)
  • 1 1/4 cup Sugar (250 g)
  • 2 cup All-purpose flour (240 g)
  • 1/2 cup Cocoa powder unsweetened (50 g)
  • 2/3 cup Dark chocolate or semi-sweet chocolate chips (100 g)
  • 1 tsp Vanilla extract
  • 1 pinch Salt
  • 1 1/2 tsp Baking powder

For the Frosting

  • 1/4 cup Cocoa powder Unsweetened (25 g)
  • 1/3 cup Unsalted butter (75 g)
  • 1/3 cup Milk (80 ml)
  • 2 1/2 cup Powdered sugar (300 g)

How to make Fudgy Zucchini Brownies

  1. Zucchini grated on a medium grater

    Grate the zucchini, including the skin, using a medium grater. Place the grated zucchini into a measuring cup and level it off to measure the quantity. Don't pack down the grated zucchini in the cup. Avoid overfilling the cup, as this can increase the brownie's baking time.

    You can chop the vegetables using a blender or food processor if desired. I don't recommend using a large grater, as large pieces of zucchini will be noticeable in the batter and the texture of the finished brownie will be different.

  2. Sugar, vegetable oil, and vanilla extract mixed in a large bowl

    Combine sugar, vegetable oil, and vanilla extract in a large mixing bowl. Mix well, the mixture will resemble wet sand.

    Instead of vanilla extract, you can use a vanilla bean or vanilla essence.

    You can use any vegetable oil, but it should be odorless. Otherwise, the finished baked goods will have the aroma of the chosen oil.

  3. Zucchini Brownies: Step 3.

    Add sifted all-purpose flour, baking powder, and unsweetened cocoa to the bowl. Add salt.

    The amount of salt can vary from 1 pinch to 1/2 tsp depending on its intensity. For sea salt, add 1/2 tsp.

  4. Dry brownie batter

    Mix the dry ingredients well in the bowl. It's most convenient to do this using a whisk or silicone spatula.

    As a result, you should get a slightly moist, loose, and uniform crumb mixture.

  5. Grated zucchini and chopped chocolate in a bowl with ingredients

    Add the grated zucchini along with its juice to the other ingredients. Then add chocolate chips or dark chocolate.

    I use regular 70% dark chocolate. You can use chocolate chips, shavings, milk chocolate, or white chocolate. The amount of chocolate can vary from 1 to 1 1/2 cups depending on your taste preferences. Remember, the lower the percentage of cocoa beans in the chocolate, the sweeter it is. Keep this in mind when substituting ingredients.

    Regular chocolate will melt completely during baking. Heat-stable chocolate chips will hold their shape well and won't spread.

  6. Zucchini brownie batter

    Mix all ingredients until uniform and let stand for 5 minutes to allow the zucchini to release its juice. Then mix thoroughly again.

    During mixing, the zucchini will start to release a lot of juice. As a result, the batter will become liquid, viscous, and shiny. The consistency of the batter will be more liquid than that of brownies made with butter.

    What to do if the batter is dry

    If the batter is dry, let it stand for another 10-15 minutes and mix again. If this doesn't help, it means the zucchini wasn't juicy enough. This can happen if you use old, dry, or overgrown vegetables.

    Add a tablespoon of water to the bowl and mix again. You can add up to 3 tablespoons of water until the crumbs come together and you get a uniform batter. Don't add too much water, as the zucchini will release liquid during baking.

    If you've added 3 tablespoons of water and the batter is still dry, add 1 chicken egg.

  7. Finished healthy zucchini brownies

    Pour the batter into a 9x13-inch baking pan greased with butter (or baking spray) and lined with parchment paper. Bake the brownies in an oven preheated to 350°F (175°C) for 25-35 minutes.

    Check for doneness using a wooden toothpick. It should come out dry, with a few moist crumbs of batter. The finished brownies should not be liquid inside, as raw zucchini is not very appetizing.

  8. Melted butter mixed with cocoa for the frosting for Zucchini Brownies

    Combine the melted butter and sifted cocoa. Mix well until you have a uniform mass.

  9. Powdered sugar in a bowl with the frosting

    Add hot milk and gradually incorporate the powdered sugar, mixing until smooth.

    The more powdered sugar you add, the thicker and denser the coating will be when set.

  10. Healthy zucchini brownies drizzled with chocolate frosting

    Let the finished brownies cool in the pan for at least 1 hour, then transfer to a wire rack to cool completely.

    Pour the frosting over the completely cooled brownies, spreading it evenly with a spatula or palette knife. This frosting is great because it forms a thin crust when it sets.

  11. Fudgy Zucchini Brownies

    The healthy zucchini brownies are ready.

    You can serve the brownies with a scoop of vanilla ice cream, fresh berries, or a sweet sauce of your choice. They're especially good the next day with a cup of aromatic coffee.

Fudgy Zucchini Brownies Video Recipe

Recipe Tips

How to Serve

Serve the brownies cooled, and cut into 16 portions. They're great on their own, but if desired, you can:

  • Drizzle with berry sauce, crème anglaise, caramel, or any other topping of your choice
  • Instead of frosting, you can use melted chocolate, sea salt, or powdered sugar
  • Serve with a scoop of vanilla ice cream, fresh berries, or whipped cream

Choosing the Best Zucchini

The main rule: Zucchini for these brownies absolutely must be juicy, as they are the primary source of moisture in this recipe. This is key for that fudgy texture!

Tips for choosing zucchini:

  • The size and variety of zucchini don't really matter. You can use regular green zucchini, yellow summer squash, or even pattypan squash. Both green and yellow types work perfectly.
  • It’s best to choose young zucchini with soft, tender skin – this also adds an extra bit of fiber!
  • If you're using large, overgrown zucchini, make sure to remove the tough outer skin and any large, developed seeds inside. Older zucchini can sometimes be a bit dry and might not provide enough liquid for the batter.

Can I Use Frozen Zucchini?

Yes, you absolutely can make these brownies using frozen zucchini! Here’s how I recommend doing it:

  • How to Freeze Fresh Zucchini for Later: Finely grate fresh zucchini (no need to squeeze it out). Measure the amount needed for one batch (3 cups for this recipe). Place it in an airtight freezer bag or container, pressing out as much air as possible, and freeze. It can be stored like this for up to 8 months.
  • Using Frozen Zucchini in the Recipe: Add the frozen grated zucchini directly to the dry ingredients mixture (around Step 5 or 6). Let the batter sit for about 10-15 minutes, stirring occasionally. This allows the zucchini to thaw right in the bowl, releasing its moisture and helping the batter reach the right consistency. Keep in mind: Because the batter starts colder with frozen zucchini, the baking time might be slightly longer than listed. Always check for doneness with a toothpick!

How to Store Zucchini Brownies

Store the completely cooled brownies in an airtight container:

  • At room temperature: They'll stay fresh for 2-3 days.
  • In the refrigerator: They can last up to 1 week (and they get even denser and fudgier when chilled – yum!).

Freezing and Thawing Baked Brownies

Good news – these brownies freeze beautifully!

  • To Freeze: Let the brownies cool completely first. Then, cut them into individual portions. Place the portions in a single layer in a freezer-safe airtight container or a zip-top freezer bag. They can be stored in the freezer for up to 3 months.
  • To Thaw: Simply leave them in the refrigerator or let them sit at room temperature until fully defrosted.
  • Quick Tip: Want to get that just-baked feel and make the chocolate chips gooey again? Gently heat a fully thawed brownie in the microwave for just 10-15 seconds. Perfect!
Nutrition (per 100 g)
15 gFats
55.1 gCarbs
3.7 gProteins
354 ccalCalories