
These fudgy zucchini blondies are packed with brown sugar sweetness and sneaky veggies, making them the perfect easy dessert bar recipe for using up summer squash.

If you have a pile of summer squash and no interest in another loaf of zucchini bread, these zucchini blondies are exactly what your kitchen needs. This is one of those zucchini desserts that tricks even the pickiest eaters, because the zucchini melts right into the batter and leaves behind nothing but moisture and soft, chewy texture. No one will guess there are vegetables hiding in this cookie bar recipe.
Think of these as a cousin to your favorite blondie, but softer, richer, and just a little more special. Buttery brown sugar, melty white chocolate chips, and a whisper of cinnamon come together in one pan, no mixer required. It is truly a dessert facile, the kind of easy treat you can throw together on a weeknight and still impress a crowd.
Before we get cooking, the right tools and ingredients make a real difference here. A sturdy box grater makes quick work of shredding zucchini, and a good quality 9x13 pan with even heat distribution helps these bars bake up golden instead of pale and gummy. Using real butter and pure vanilla extract instead of imitation also makes a noticeable difference in flavor.
Zucchini might seem like an odd addition to zucchini recipes dessert lovers who are used to savory preparations, but it works the same magic here as it does in classic zucchini bread recipes. The shredded squash breaks down as it bakes, adding moisture and a tender crumb without contributing any real flavor of its own. That means you get all the fudgy texture of a bakery style blondie, with a sneaky boost of veggies mixed in.
This is also a fantastic way to use up an overflowing garden harvest. If you find yourself drowning in squash every summer, rotating between muffins, bread, and now these blondies is a delicious way to keep things interesting.
Chef's Tip: Squeeze the shredded zucchini in a clean towel until it feels almost dry. Skipping this step is the most common reason blondies turn out dense or undercooked in the middle.
The secret to a great blondie, zucchini or otherwise, is restraint. Overmixing the batter once the flour goes in will develop too much gluten and give you a cakey texture instead of that dense, chewy bite blondies are known for. Stir just until the flour disappears, then fold in your mix ins with a light hand.
A few tips for the best texture every time:
These small details make the difference between an average bar and one of those eat dessert worthy squares that disappears in minutes.
Ready to make it? Here is the full step-by-step recipe:

These fudgy zucchini blondies are packed with brown sugar sweetness and sneaky veggies, making them the perfect easy dessert bar recipe for using up summer squash.
Preheat the oven to 350 degrees F (175 degrees C). Line a 9x13 inch baking pan with parchment paper, leaving an overhang on the sides for easy removal.
Shred the zucchini using a box grater. Place it in a clean kitchen towel or paper towels and squeeze firmly to remove as much excess water as possible.
In a large mixing bowl, whisk together the melted butter and brown sugar until smooth and no lumps of sugar remain.
Whisk in the egg and vanilla extract until fully combined and glossy.
Fold in the shredded zucchini until evenly distributed throughout the wet mixture.
In a separate bowl, whisk together the flour, baking powder, salt, and cinnamon.
Add the dry ingredients to the wet mixture and stir with a spatula just until combined. Do not overmix.
Fold in the white chocolate chips, reserving a small handful to sprinkle on top.
Pour the batter into the prepared pan and spread it evenly to the edges. Sprinkle the reserved chocolate chips on top.
Bake for 25 to 30 minutes, until the edges are golden and a toothpick inserted in the center comes out with a few moist crumbs.
Let the blondies cool completely in the pan on a wire rack before lifting them out and slicing into 16 squares.
These blondies are wonderful served slightly warm with a scoop of vanilla ice cream, or at room temperature with a cup of coffee. For a fun twist on classic cookie desserts, try adding chopped walnuts or pecans for crunch, or swirl in a spoonful of peanut butter before baking.
If you are looking for mini desserts for a party or bake sale, cut the bars smaller and let each guest grab a bite sized square. They hold up beautifully at room temperature for a few hours, making them easy to transport.
Store any leftovers in an airtight container to keep them soft and moist. Whether you call them blondies, bars, or squares, this recipe is proof that zucchini desserts deserve just as much love as zucchini's savory side dishes.