Brownie Mix Peanut Butter Cookies

Name: Brownie Mix Peanut Butter Cookies
Prep time: 10 min
Cook time: 15 min
Total time: 25 min
Yield: 18 cookies
Ingredients: 1 box of brownie mix (family size); 1/2 cup peanut butter; 1/3 cup vegetable oil; 2 large eggs; 1/2 cup chocolate chips (optional)

Highlighted under: Sweet Homemade Goodness

I absolutely love making these Brownie Mix Peanut Butter Cookies whenever I crave a sweet treat. The combination of rich brownie flavor with creamy peanut butter is simply irresistible. This recipe is not only quick and easy but also requires minimal ingredients that you probably already have on hand. Perfect for sharing or indulging on a cozy afternoon, these cookies are a delightful twist on two classic desserts that makes for a fun baking adventure in the kitchen!

Created by

Amelia Grant

Last updated on 2026-02-28T00:37:36.233Z

When I decided to make these Brownie Mix Peanut Butter Cookies, I was looking for a way to combine two favorite flavors into one delicious treat. By using brownie mix as a base, not only did I save time, but I also got that rich, chocolatey goodness that takes these cookies to the next level. Adding peanut butter made them wonderfully chewy and gave an extra layer of flavor that everyone loved!

Tip: To achieve the perfect texture, be careful not to overmix the dough. I find that using a rubber spatula works best to fold in the ingredients without losing that lovely chunky peanut butter texture. You’ll want each bite to bring a delightful balance of chocolate and peanut butter goodness.

Why You'll Love These Cookies
Rich, chocolatey brownie flavor with a peanut butter twist
Super easy to make, perfect for beginners
Chewy texture that satisfies your sweet tooth

Understanding the Ingredients

The foundation of these Brownie Mix Peanut Butter Cookies is the brownie mix, which gives them a rich chocolate flavor. Choosing a family-sized box ensures you have enough mixture for a generous batch, perfect when sharing with friends or family. The addition of peanut butter not only enhances flavor but also contributes to the cookies’ chewy texture. I recommend using natural peanut butter for a more wholesome taste, but creamy or crunchy varieties can work too. Just remember, the type used will slightly affect the cookie's texture.

Vegetable oil in this recipe acts as a binder that helps keep the cookies moist. While it’s a great option, you could substitute it with melted coconut oil for a subtle tropical flavor, or even applesauce for a healthier twist. If going with applesauce, start with 1/4 cup and watch your cookie texture, as it may need adjustment. Also, adding chocolate chips is optional but highly recommended—they melt into gooey pockets of chocolate, complementing the peanut butter beautifully.

Baking Tips for Perfect Cookies

When shaping the dough, make sure the balls are uniform in size for even baking. I like to use a cookie scoop for consistency, as this allows them to bake uniformly. Leave about 2 inches of space between each ball on the baking sheet to prevent them from merging during baking. An extra sprinkle of sea salt on top before baking can enhance the flavors and provide a nice contrast to the sweetness of the cookies.

Keep an eye on them while baking—12-15 minutes is the sweet spot, but every oven is slightly different. The cookies should appear set around the edges but soft in the center. If they’re overbaked, you may lose that delightful chewy texture, so trust your instincts and remove them as soon as the edges look firm. Letting them sit on the baking sheet for a few minutes before transferring to a cooling rack will allow them to firm up perfectly.

Ingredients

For the Cookies

1 box of brownie mix (family size)
1/2 cup peanut butter
1/3 cup vegetable oil
2 large eggs
1/2 cup chocolate chips (optional)

Mix these ingredients together for a delicious treat!

Instructions

Preheat and Prepare

Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper.

Mix Ingredients

In a large bowl, combine the brownie mix, peanut butter, vegetable oil, and eggs. Stir until well blended. If using, fold in the chocolate chips.

Shape the Dough

Using a tablespoon, scoop out the dough and roll it into balls. Place them on the prepared baking sheet, spacing them about 2 inches apart.

Bake

Bake in the preheated oven for 12-15 minutes, or until the edges are firm but the centers are still soft.

Cool and Enjoy

Allow the cookies to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely. Enjoy your delicious cookies!

Serve these cookies warm or store them in an airtight container for later.

Pro Tips

For extra flavor, try adding a pinch of sea salt on top of the cookies before baking.

Storage and Serving Ideas

These Brownie Mix Peanut Butter Cookies can be stored in an airtight container for up to a week at room temperature. If you want to keep them for longer, consider freezing them. Simply place the cooled cookies in a freezer-safe bag, separating layers with parchment paper, and they can last for up to three months. When ready to enjoy, just thaw them at room temperature for an hour or pop them in the microwave for 10-15 seconds for that freshly baked taste.

Serving these cookies is simply delightful! Pair them with a glass of cold milk or a scoop of vanilla ice cream for an indulgent dessert. For a fun twist, try crumbling a few cookies over sundaes or incorporating them into milkshakes. Your friends and family will love this unexpected treat, and it’s an excellent way to elevate a classic dessert into something special.

Variations to Try

Feel free to experiment with mix-ins or swaps to personalize these cookies. For a nutty crunch, add chopped nuts like walnuts or pecans. You could also introduce flavors by incorporating a teaspoon of vanilla extract into the dough, which will complement the chocolate and peanut butter beautifully. If you’re looking for a peanut-free version, replace the peanut butter with sunflower seed butter—it behaves similarly and adds a unique flavor profile.

For those who enjoy a bit of spice, consider adding a pinch of cinnamon or a splash of espresso powder to enhance the chocolatey taste even further. These alterations allow you to tailor the cookies to your taste preferences, and they can turn a simple recipe into a unique family favorite. Have fun experimenting with different combinations!

Questions About Recipes

→ Can I make these cookies without peanut butter?

Yes! You can substitute the peanut butter with almond butter or even skip it for a brownie-only cookie.

→ What type of brownie mix works best?

Any family-sized brownie mix will work, but I recommend using one with chocolate chunks for added texture.

→ How do I store leftover cookies?

Store them in an airtight container at room temperature for up to a week. You can also freeze them for longer storage!

→ Can I add nuts to this recipe?

Absolutely! Chopped walnuts or pecans would add a great crunch to these cookies.