Last updated on October 6th, 2025 at 09:18 am
These super easy Halloween Blondies come together in minutes, don’t require a mixer, and are bursting with chopped Oreos, seasonal sprinkles, and orange and brown M&Ms. Talk about a perfect treat for October!
If you’re on the hunt for easy Halloween desserts that still look adorable on a party platter, this one’s for you. These blondies are soft and chewy with a brown sugar base, and every bite is filled with cookie chunks, melty chocolate, and that extra crunch from Halloween sprinkles. Plus, they’re easy to slice and serve, which makes them one of my favorite easy fall party desserts to bring to work events, Halloween get-togethers, or even just a cozy night at home with a spooky movie.
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Ingredients for Halloween Blondies
Here’s everything you’ll need to make these festive bars:
- 1 cup (2 sticks) unsalted butter, melted and slightly cooled
- 1 1/2 cups light brown sugar, packed
- 2 large eggs
- 2 tsp vanilla extract
- 2 cups all-purpose flour
- 1 tsp baking powder
- 1/4 tsp salt
- 1 1/2 cups orange and brown M&M’s
- 1/2 cup Halloween sprinkles
- 10 Oreos, roughly chopped
Optional: reserve a few M&Ms, sprinkles and a bit of Oreos to sprinkle on top halfway through baking. It makes them look bakery-perfect every time.
How to Make Halloween Blondies
This recipe is so simple, you’ll want to make it on repeat all season long. Here’s how it comes together:
1. Preheat your oven to 350°F (175°C) and line a 9×13-inch pan with parchment paper, leaving overhang for easy removal.
2. In a large bowl, whisk together the melted butter and brown sugar until smooth.
3. Add eggs and vanilla extract, whisking until combined.
4. Add in the flour, baking powder, and salt. Mix until just combined; avoid overmixing.
5. Fold in 1 ¼-ish cups of M&M’s, most of the sprinkles and most of the Oreos (reserve the rest for decorating the top).
6. Spread the batter evenly into the prepared pan.
7. Bake for 10-15 minutes, then sprinkle extra M&M’s, sprinkles and a few chopped Oreos on top for decoration
8. Bake for an additional 10-15 minutes, or until the edges are golden and a toothpick inserted near the center comes out with a few moist crumbs.
9. Cool completely in the pan before slicing into bars.
Pro Tips for the Best Halloween Blondies
- Don’t skip the parchment paper. It makes removing and slicing the blondies so much easier.
- Use room temperature ingredients. Especially the egg, because this helps everything mix smoothly.
- Customize your mix-ins. These blondies are easy to adapt with whatever fall candies or mix-ins you have on hand. Candy corn, peanut butter cups, or chopped chocolate bars would be amazing too.
- Sprinkle some extra toppings on top. I know this is in the instructions too, but I really think it adds a touch of prettiness to this recipe for pretty much no extra effort. Keep aside a few M&Ms, some sprinkles and some Oreo bits before baking. About halfway through, remove the pan from the oven and evenly sprinkle the extras on top. Then, pop everything back in the oven until baked. It makes a huge difference for presentation in the end.
These are one of my favorite Halloween-themed desserts to bring to a party because they’re just so easy to make and so fun to serve. Plus, they travel well and still taste amazing a day or two after baking, if they last that long!
FAQs
Can I use dark brown sugar instead of light?
Yes! It’ll give the blondies a slightly richer, more caramel-y flavor. Either one works.
How do I store blondies?
Store them in an airtight container at room temperature for up to 4 days. You can also freeze them for up to 2 months—just slice and wrap individually for easy grab-and-go treats.
What kind of Oreos work best?
I usually use Double Stuf Oreos (They’re my favorite!), but Halloween Oreos with orange filling look super cute in these if you can find them. Regular Oreos also work just fine!
Can I add chocolate chips too?
Absolutely! If you want extra chocolatey blondies, feel free to toss in 1/4 to 1/2 cup of chocolate chips along with the M&Ms and Oreos.
What kind of sprinkles should I use?
I recommend a Halloween-themed blend of sprinkles that is primarily jimmies or something more “sturdy.” I think things like sanding sugar would probably just dissolve in the batter in the end and wouldn’t really be visible.
Whether you’re baking for a Halloween party, making a treat for your family, or just craving something sweet and festive, these Halloween blondies are the answer. They’re simple, chewy, and loaded with goodies in every bite.
I love that they’re one of those easy Halloween desserts that don’t require any decorating skills but still look super cute and colorful on a dessert table. They’re definitely the kind of easy fall party dessert that disappears fast, so don’t be surprised if you need to make a second batch!
Halloween Blondies
Ingredients
- 1 cup (2 sticks) unsalted butter melted and slightly cooled
- 1 1/2 cups light brown sugar packed
- 2 eggs
- 2 tsp vanilla
- 2 cups flour
- 1 tsp baking powder
- 1/4 tsp salt
- 1 1/2 cups orange and brown M&Ms or Halloween M&Ms if you can find them
- 1/2 cup Halloween sprinkles
- 10 Oreos roughly chopped
Instructions
- Preheat your oven to 350°F (175°C) and line a 9×13-inch pan with parchment paper, leaving overhang for easy removal.
- In a large bowl, whisk together the melted butter and brown sugar until smooth.
- Add eggs and vanilla extract, whisking until combined.
- Add in the flour, baking powder, and salt. Mix until just combined—avoid overmixing.
- Fold in most of the M&Ms, sprinkles and chopped Oreos, but save a little bit of each to sprinkle on top later.
- Spread the batter evenly into the prepared pan.
- Bake for 10-15 minutes, then sprinkle extra M&M’s, sprinkles and a few chopped Oreos on top for decoration
- Bake for an additional 10-15 minutes, or until the edges are golden and a toothpick inserted near the center comes out with a few moist crumbs.
- Cool completely in the pan before slicing into bars.
