These cookies turn fresh garden zucchini into a deeply rich, sweet treat with notes of dark chocolate, brown sugar, and molasses. They pack the perfect balance of hearty texture and gooey dark chocolate pockets into a handheld cookie, all finished with a bakery-style sprinkle of flaky sea salt.
The Secret to the Chewiest Oatmeal Cookies
Who can relate to the mid-summer zucchini explosion? If you’ve ever grown it yourself or had a neighbor drop off a massive bag of it on your porch, you know that bit of panic when you realize you need to use it up before it goes bad. They are thick, soft but chewy, and loaded with deep, rich chocolate flavors that make you forget you’re eating vegetables. By pairing those hidden greens with rich molasses and dark chocolate flavors, you get a bakery-style treat.
The secret to giving these cookies their thick, ultra-chewy center is using a simple combination of old-fashioned oats and ground oats. Most zucchini cookies turn out soft, cakey, or resembling little muffin tops because of the veggie’s high water content. By pairing rich molasses with the different oat textures, the cookies develop a deeply flavorful, chewy cookie. Let me show you how to make one of my favorite summer cookies!
What You Need to Make These Cookies
Aside from the fresh zucchini, this recipe relies entirely on everyday baking staples you likely already have tucked away in your pantry and fridge.
- Old Fashioned Rolled Oats
- Shredded Zucchini
- Dry Ingredients
- Egg
- Butter
- Dark Chocolate Chips
Chef Lori’s #1 Tip for Having Dried Zucchini
Squeeze, Then Air-Dry: Zucchini is essentially a sponge filled with water. After shredding, wrap it tightly in a clean flour sack towel or a stack of heavy paper towels, then squeeze out as much liquid as possible.
To ensure a perfect chew, line a cooling rack with paper towels, spread the shredded zucchini in a single layer, and let it sit for about 30 minutes to dry further.
Always measure your zucchini after it has dried. Skipping this step introduces too much excess moisture, causing your cookies to spread and lose their chewy bite.
How to Make Oat Chocolate Chip Zucchini Cookies
This dough comes together quickly and doesn’t require any fancy tools. You can use a stand mixer fitted with the paddle attachment, a hand mixer, or just a good old-fashioned mixing bowl and wooden spoon.
- Whisk the dry ingredients: In one bowl, stir together the old-fashioned oats, flour, ground oats, cinnamon, salt, and baking soda; set aside.
- Cream the butter and sugars: In a separate bowl, cream the softened butter and both sugars together until the mixture is smooth, light, and fluffy (about ~3-5 minutes). Mix in the molasses and vanilla bean paste until fully incorporated.
- Combine the wet and dry ingredients: Stir the dried zucchini into the wet mixture. Add the dry ingredients and mix just until combined. It’s okay to see a few small streaks of flour.
- Fold in the chocolate: Fold in the chocolate chips until they are evenly distributed.
- Scoop and chill: Using a large cookie scoop, drop the dough balls onto a parchment-paper-lined baking sheet. Cover it tightly and chill for at least 2 hours before baking.
- Bake with two temperatures: Preheat the oven to 375°F (190°C). Place the dough balls 2-3″ apart. Bake the cookies for 8 minutes, then reduce the oven temperature to 350°F (180°C) and bake for another 5-6 minutes, or until the edges are golden brown. The centers should still look slightly underbaked; they will finish firming up as they cool.
- Shape and cool: Remove the pan from the oven and immediately sprinkle the cookies with sea salt flakes. If you want your cookies to have that perfectly round shape, use a thin spatula or cookie rings to “round out” the edges while they are hot. Leave the cookies on the pan for 15 minutes, then carefully transfer them to a cooling rack to cool completely.
Why You’ll Love This Recipe
The ground oats act as a natural binder, absorbing liquid from the zucchini so the cookie stays chewy without turning soggy. Whole rolled oats give you the classic, rustic texture you expect. Balanced with dark chocolate and a final crunch of sea salt flakes, it’s an elevated twist on a classic favorite.
- Thick & Chewy Texture: Combining the two types of oats locks in moisture without making the dough soggy, giving you a bakery-style bend and chew.
- Deep, Rich Flavors: Sweet molasses and dark chocolate elevate the flavor profile beyond a typical oatmeal cookie.
- Sneaky Greenery: If you have those picky eaters who refuse to try veggies, this is an incredible way to pack fresh zucchini into a decadent sweet treat!
- Stays Fresh for Days: Thanks to the natural moisture from the zucchini and molasses, these cookies don’t dry out overnight and taste just as soft and chewy on day four!
Zucchini Oatmeal Cookie FAQs
- Do I need to peel the zucchini before grating? No. The zucchini’s skin is incredibly tender and melts seamlessly into the cookie dough as it bakes. Plus, keeping the skin on adds beautiful, bright green flecks throughout the dark chocolate.
- How do I make ground oats? To a food processor, add 1 1/2 cups of old-fashioned ground oats and pulse 5-6 times to make 1 cup of ground oats.
- Can I use quick oats instead of old-fashioned rolled oats? I would advise against it. Quick oats are cut much thinner and absorb moisture like a sponge, which can make your cookie dough dry and crumbly.
- Do I need to chill the dough before baking? Absolutely; it’s a must! Chilling gives the ground oats and flour time to fully absorb the zucchini’s liquid and allows the butter to firm up, which helps prevent the cookies from spreading flat.
- Can I freeze the cookie dough? Yes, this dough freezes beautifully. BUT keep in mind you MUST make sure the zucchini is dry. Portion the dough into balls with a large cookie scoop on a baking sheet, freeze solid for an hour, then transfer to a freeze-safe container. Bake straight from frozen, adding 1-2 minutes to the baking time.
- Why did my cookies turn out cakey? This usually happens if the zucchini wasn’t squeezed and dried enough before adding it to the dough, or if the flour wasn’t measured correctly.
Cookie Substitutions and Additions
Whether you need to swap an ingredient or customize it to what you have on hand, this dough is incredibly forgiving and easy to make your own!
- Ground Oats: Why buy ground oats when you can simply toss your old-fashioned oats into a food processor and pulse 5-6 times until they resemble a coarse, sandy flour? Rule of thumb: 1 1/2 cups of old-fashioned ground oats = 1 cup of ground oats
- Dark Chocolate: Swap the dark chocolate chips for semi-sweet chips, or use a chopped chocolate bar
- Molasses: Dark barley malt syrup is your best swap for that signature, rich, deeply toasted flavor.
- Toasted Nuts: Fold in about 1/2 cup of chopped pecans or walnuts, along with the chocolate chips, to add a rich, buttery crunch.
- Dried Fruit: Replace a small handful of the chocolate chips with dried cranberries or raisins.
How to Correctly Measure Shredded Zucchini
When a recipe calls for shredded zucchini, it’s easy to accidentally add too much moisture if you don’t measure it correctly. For these cookies, always grate and dry your zucchini before you measure it out.
Once your zucchini is as dry as can be (follow the Chef Pro Tip above), gently spoon it into your measuring cup. Do not pack it down tightly like you would brown sugar. Packing it into a cup forces too much extra moisture from the vegetables into the dough, causing your cookies to spread flat and lose their distinctive chewy bite.
Here’s what I used:
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Chef Lori’s Recipe Thoughts
Mr. Fantabulous is not a huge fan of zucchini in general, although he loves my Easy Zucchini Strips with Parmesan Crust. But for decades, whenever I made zucchini cookies, he would immediately turn up his nose and scoff, as if I had insulted the cookie gods. It got so bad that whenever I made zucchini bread or cookies, I had to bake him his own batch without it. And mind you, it’s not as simple as just removing the zucchini. It’s literally an entirely different recipe.
When we moved to Arizona almost 6 years ago, I made it my mission to create a zucchini cookie that he would love. It took me years of testing and perfecting the recipe for him to finally admit that zucchini does belong in cookies. This version is thick, deeply flavorful, and stays soft and chewy for days. In fact, it’s so good that he actually asks me to make it now. It’s a recipe I truly love, and I know your family will love it, too!
Chewy Oatmeal Zucchini Chocolate Chip Cookies
Turn fresh garden zucchini into the ultimate decadent dessert! These thick, chewy oatmeal zucchini chocolate chip cookies strike the perfect balance between hearty oats and gooey dark chocolate pockets, with deep notes of brown sugar and molasses. Discover the dual-oat secret to keeping these bakery-style cookies perfectly chewy and never cakey.
- Prep Time: 45 minutes *see note
- Chilling Time: 2 hours
- Cook Time: 13-16 minutes
- Total Time: 1 hour (does not include chilling)
- Yield: 15 cookies
Ingredients
- 1 cup (120g) shredded zucchini (1 medium 6-8”), squeezed dry – measure it after it’s dry
- 1 cup (90g) old fashioned oats
- 1 cup ground oats (made by blending 1 1/2 cups of old-fashioned oats)
- 1 1/4 cup (150g)all purpose flour
- 3/4 teaspoon (4g) baking soda
- 1 teaspoon (2g) cinnamon
- 3/4 teaspoon (4g) kosher salt
- 8 Tablespoons (113g/1 stick) butter, unsalted and very soft
- 1/2 cup (100g) granulated sugar
- 1/2 cup (100g) light brown sugar, packed
- 1 large (50g) egg, room temperature
- 1 Tablespoon (20g) molasses (not blackstrap)
- 1 Tablespoon (15g) vanilla bean paste
- 2 cups (340g) dark chocolate chips
Instructions
- Whisk the dry ingredients: In one bowl, stir together the old-fashioned oats, flour, ground oats, cinnamon, salt, and baking soda; set aside.
- Cream the butter and sugars: In a separate bowl, cream the softened butter and both sugars together until the mixture is smooth, light, and fluffy (about ~3-5 minutes). Mix in the molasses and vanilla bean paste until fully incorporated.
- Combine the wet and dry ingredients: Stir the dried zucchini into the wet mixture. Add the dry ingredients and mix just until combined. It’s okay to see a few small streaks of flour.
- Fold in the chocolate: Fold in the chocolate chips until they are evenly distributed.
- Scoop and chill: Using a large cookie scoop, drop the dough balls onto a parchment-paper-lined baking sheet. Cover it tightly and chill for at least 2 hours before baking.
- Bake with two temperatures: Preheat the oven to 375°F (190°C). Place the dough balls 2-3″ apart. Bake the cookies for 8 minutes, then reduce the oven temperature to 350°F (180°C) and bake for another 5-6 minutes, or until the edges are golden brown. The centers should still look slightly underbaked; they will finish firming up as they cool.
- Shape and cool: Remove the pan from the oven and immediately sprinkle the cookies with sea salt flakes. If you want your cookies to have that perfectly round shape, use a thin spatula or cookie rings to “round out” the edges while they are hot. Leave the cookies on the pan for 15 minutes, then carefully transfer them to a cooling rack to cool completely. Once cooled, store in an airtight container for up to 5 days.
Notes
Prep Time:
This accounts for grating the zucchini, letting it air-dry for 30 minutes, pulsing the oats, and mixing the dough
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