Easy Candy-Stuffed Brownies Made with a Box Mix (Inspired by the Pioneer Woman's Crazy Brownies)
Imagine biting into a thick, chocolatey brownie and finding gooey caramel, melted peanut butter cups, and pieces of chocolate sandwich cookies inside. Then there's a colorful, crunchy Halloween topping!
These brownies are rich, chewy, a little messy, and completely irresistible. And because we're starting with a boxed brownie mix, they're easy enough to make with the kids.
💕Why You'll love these Halloween Brownies:
- Super easy shortcut: One boxed mix does most of the work.
- Surprise filling: Chocolate cookies, peanut butter cups, and caramel create different flavors in every bite.
- Sweet and salty: The pretzels balance the sweetness and add crunch.
- Fun to decorate: Kids can make each brownie look like its own silly little monster.
- Perfect for leftover Halloween candy: Swap in your family's favorite chocolate candies.
If you love this recipe, you'll also need to try my Halloween Chocolate Bark (with Graham Crackers) and Candy Corn Bark😋
Ingredients for the Halloween Monster Mash Brownies:
Jump to:
- 💕Why You'll love these Halloween Brownies:
- Ingredients for the Halloween Monster Mash Brownies:
- How to make the halloween brownies:
- Why You'll Love These Brownies:
- My Favorite Tips & Tricks for the best halloween brownies:
- Fun Variations for the halloween brownies:
- Storage and Make-Ahead:
- FAQs:
- Recent Recipes:
- Easy Halloween Brownies with Candy (Monster Mash Brownies)
How to make the halloween brownies:
1. Prepare the oven and pan. Preheat the oven according to your brownie mix package, generally 325–350°F. Line an 8×8-inch metal baking pan with parchment paper and lightly grease it.
2. Make the brownie batter. Prepare the boxed brownie mix using the eggs, oil, and water listed on the package. Stir just until combined.
3. Build the bottom layer. Spread approximately half the brownie batter into the prepared pan.
4. Add the surprise filling. Scatter the chopped Oreos and miniature peanut butter cups evenly over the batter, keeping the filling about ½ inch away from the edges. Drizzle with thick caramel sauce and sprinkle with flaky sea salt, if using.
5. Add the top layer. Spoon the remaining brownie batter over the candy filling. Gently spread it to cover as much of the filling as possible.
6. Immediately scatter the mini M&M's, crushed pretzels, sprinkles, and any candy of your choice over the brownie batter.
7. Bake. Follow the package's baking temperature and begin checking at the recommended time. Because these brownies are stuffed, they may need an additional 5–10 minutes. Expect approximately 35–45 minutes for many mixes. The edges should be set, and a toothpick inserted into a brownie-only section should come out with moist crumbs rather than wet batter.
7. Cool completely. Let the brownies cool in the pan, then refrigerate for 20–30 minutes if you'd like cleaner slices.
Slice and enjoy! Once the coating has set, cut into squares.
Why You'll Love These Brownies:
- Super easy shortcut: One boxed mix does most of the work.
- Surprise filling: Chocolate cookies, peanut butter cups, and caramel create different flavors in every bite.
- Sweet and salty: The pretzels balance the sweetness and add crunch.
- Fun to decorate: Kids can make each brownie look like its own silly little monster.
- Perfect for leftover Halloween candy: Swap in your family's favorite chocolate candies.
My Favorite Tips & Tricks for the best halloween brownies:
Use a fudge brownie mix rather than a cakey one. The dense, chewy texture holds the candy filling especially well.
Don't add the colorful candy before baking. Halloween candy coatings can crack or lose their bright colors in the oven. Save them for decorating.
Try warming your caramel sauce slightly. A few seconds in the microwave makes thick caramel easier to drizzle, but avoid using a thin, watery caramel syrup.
Don't worry about perfect decorations. The crazier the drizzles and candy eyeballs, the better these little monsters look!
Fun Variations for the halloween brownies:
| Variation | How to make it |
|---|---|
| Cookies & Scream | Replace peanut butter cups with extra chopped Oreos and white chocolate chips |
| Salted Caramel Monster | Replace peanut butter cups with chopped chocolate-covered caramels |
| Candy Bar Explosion | Substitute chopped Snickers, Milky Way, or Twix for the cookie-and-peanut-butter filling |
| S'mores Monster | Use graham cracker pieces and chocolate chips inside, then decorate with mini marshmallows |
| Triple Chocolate Monster | Add ¼ cup mini chocolate chips to the filling and top with chocolate cookie crumbs |
Storage and Make-Ahead:
Store brownies in an airtight container at room temperature for up to 3 days or refrigerate for up to 5 days. Freeze undecorated brownies for up to 2 months.
You can bake the brownies a day ahead and decorate them just before your Halloween party.
FAQs:
Can I use a chocolate cake mix like The Pioneer Woman?
You can, but cake mix needs a different ratio of liquids and fat to produce the dense, chewy texture. I recommend sticking with a fudge brownie mix for this version.
Can I double the recipe?
Yes! Use two boxes and a 9×13-inch pan if the mix brands' combined package directions support that pan size. Follow the recommended baking time and check for doneness.
Recent Recipes:
Easy Halloween Brownies with Candy (Monster Mash Brownies)
Equipment
- 8×8-inch square baking pan
- Parchment Paper:
- large mixing bowl
- Whisk or rubber spatula
- measuring cups and spoons
Ingredients
Brownie Base:
- 1 box (about 15 ounces) fudge brownie mix, designed for an 8×8-inch or 9×9-inch pan
- Eggs, oil, and water called for on the brownie mix package
Surprise Candy Filling:
- 6 Oreo cookies, roughly chopped
- 8 miniature peanut butter cups, unwrapped and halved
- 2 tablespoon thick caramel sauce
- ¼ teaspoon flaky sea salt, optional
Halloween Monster Topping:
- Halloween candy decor (pumpkins, ghosts, bats, etc...
- ⅓ cup Halloween-colored mini M&M's
- ¼ cup crushed salted pretzels
- 2 tablespoon Halloween sprinkles
- candy eyeballs
- candy corn
Instructions
- 1. Prepare the oven and pan. Preheat the oven according to your brownie mix package, generally 325–350°F. Line an 8×8-inch metal baking pan with parchment paper and lightly grease it.
- 2. Make the brownie batter. Prepare the boxed brownie mix using the eggs, oil, and water listed on the package. Stir just until combined.
- 3. Build the bottom layer. Spread approximately half the brownie batter into the prepared pan.
- 4. Add the surprise filling. Scatter the chopped Oreos and miniature peanut butter cups evenly over the batter, keeping the filling about ½ inch away from the edges. Drizzle with thick caramel sauce and sprinkle with flaky sea salt, if using.
- 5. Add the top layer. Spoon the remaining brownie batter over the candy filling. Gently spread it to cover as much of the filling as possible.
- 6. Decorate! Immediately scatter the mini M&M's, crushed pretzels, sprinkles, and candy eyeballs over the top.
- 7. Bake. Follow the package's baking temperature and begin checking at the recommended time. Because these brownies are stuffed, they may need an additional 5–10 minutes. Expect approximately 35–45 minutes for many mixes. The edges should be set, and a toothpick inserted into a brownie-only section should come out with moist crumbs rather than wet batter.
- 8. Add the halloween candy decor(if using) while the brownies are still warm before cooling. Cool completely. Let the brownies cool in the pan, then refrigerate for 20–30 minutes if you'd like cleaner slices.
- 9. Slice and enjoy! Once the coating has set, cut into squares.
