Brownie Mix Peanut Butter Cookies

Highlighted under: Oven-Kissed Treats

I absolutely love baking, and these Brownie Mix Peanut Butter Cookies bring together two of my favorite treats in one delightful bite. The chewy texture of brownie mix combined with the creamy richness of peanut butter creates a unique cookie that's not overly sweet yet totally satisfying. Whether you need a quick treat for guests or a simple dessert for the family, these cookies are a go-to in my kitchen. Plus, they come together in a flash, so you can indulge without spending hours in the kitchen!

Lillian Hayes

Created by

Lillian Hayes

Last updated on 2026-02-24T00:09:38.513Z

When I first attempted these cookies, I was amazed at how simple and quick they were to make. Using brownie mix as the base not only saves time but also adds a rich chocolate flavor that complements the peanut butter perfectly. I learned that the key to achieving that perfect cookie texture is to not overmix the batter once the peanut butter is added; this lets the cookies maintain a chewy center.

After testing several versions, I found that a sprinkle of sea salt on top just before baking elevates the flavor even more. This little touch balances the sweetness and enhances the overall taste, making them irresistible fresh out of the oven!

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Why You'll Love These Cookies

  • Decadent chocolate and peanut butter flavor in every bite
  • Quick and easy to prepare, perfect for busy bakers
  • Soft and chewy texture that satisfies your sweet tooth

The Role of Brownie Mix

Using brownie mix as the base for these cookies not only simplifies the process but also infuses each cookie with rich chocolate flavor. The mix already contains cocoa powder and sugar in perfect proportions, so you won't have to worry about balancing dry ingredients. This is particularly helpful for novice bakers or those seeking a quicker method. Just remember to choose a high-quality brownie mix to ensure that the chocolate flavor shines through in your cookies.

One crucial aspect when working with brownie mix is understanding the moisture content. Brownie mixes are designed for fudginess, and this recipe benefits from that. The resulting cookie should have a soft, chewy center. Ensure you don’t overbake, as this can lead to a drier texture. For optimal results, I recommend checking at the 12-minute mark; the edges should be subtly set while the centers remain slightly soft.

Peanut Butter Perfection

The addition of peanut butter not only enhances flavor but also contributes to the cookie's overall chewy texture. If you're a fan of a more pronounced peanut flavor, using a natural peanut butter can make a significant difference. Natural peanut butter often has a richer taste and creamier consistency, but be cautious of the oil separation; just stir it well before measuring. For those with nut allergies, feel free to substitute sun butter or a similar spread for an equally delightful outcome.

A fun tip when mixing in the peanut butter: you may find a hand mixer makes the job easier, especially to achieve a smooth and creamy dough. Blend until all the ingredients are well incorporated, but be careful not to overmix, as excessive mixing can lead to tougher cookies. The goal is a dough that is thick yet pliable, ready to form into those irresistible dollops on your baking sheet.

Storing and Enjoying Your Cookies

Once your cookies are baked, the best way to store them is in an airtight container at room temperature. They will stay fresh for about 3-5 days. If you want to keep them longer, consider freezing them! Allow the cookies to cool completely, then place them in a freezer-safe container with parchment paper between layers to prevent sticking. They can last up to 3 months in the freezer and will taste just as delicious when thawed.

Serving these cookies warm, straight out of the oven, is a treat all on its own. If you want to elevate the experience, serve them with a scoop of vanilla ice cream or a drizzle of chocolate sauce. For gatherings, consider making them ahead of time, as they pair wonderfully with coffee or milk. Remember to keep some extra chocolate chips on hand to sprinkle on top just before baking for an extra decadent visual and flavor boost!

Ingredients

Gather the following ingredients to get started with these scrumptious cookies:

Ingredients

  • 1 box brownie mix (about 18.4 oz)
  • 1/2 cup peanut butter
  • 1 large egg
  • 1/4 cup vegetable oil
  • 1/2 cup chocolate chips (optional)
  • Sea salt for sprinkling (optional)

Make sure all ingredients are at room temperature for best results.

Instructions

Follow these simple steps to create your delicious cookies:

Preheat the Oven

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

Mix Ingredients

In a large mixing bowl, combine the brownie mix, peanut butter, egg, and vegetable oil. Stir until just combined, being careful not to overmix.

Add Chocolate Chips

If using, fold in the chocolate chips to the cookie dough for an extra chocolatey burst.

Scoop the Dough

Using a tablespoon or cookie scoop, drop dollops of dough onto the prepared baking sheet, spacing them about 2 inches apart.

Sprinkle with Sea Salt

If desired, sprinkle a pinch of sea salt on top of each cookie for added flavor.

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 a few minutes before transferring them to a wire rack. Enjoy them warm or at room temperature!

Make sure to store any leftovers in an airtight container to keep them fresh.

Pro Tips

  • For extra decadence, try adding chopped nuts or using flavored peanut butter. You can also experiment with different types of brownie mixes for unique flavors.

Troubleshooting Common Issues

If you find your cookies spreading too much while baking, it might be due to the warmth of your ingredients. Make sure your peanut butter is not overly melted and consider chilling the dough for 30 minutes. This will help the cookies maintain their shape during baking. Additionally, keep an eye on your oven's temperature with an oven thermometer; sometimes, home ovens can run hot or cold, affecting baking time and cookie texture.

On the other hand, if your cookies turned out too puffy and didn't flatten, it could mean the dough was overmixed. While a fluffy cookie sounds appealing, in this case, we want them to be more dense and chewy. Next time, mix until just combined for that perfect consistency. If you're experimenting with different flours or substitutes, be sure to adjust additional liquid to maintain the right dough texture.

Variations to Try

Feeling adventurous? You can customize these cookies with various mix-ins. Try adding chopped nuts for a crunchy contrast or swirl in some caramel for a gooey center. For an autumn twist, incorporate a dash of cinnamon and nutmeg to the dough and top with a sprinkle of chopped apples or cranberries. This way, you can enjoy seasonal versions of your favorite treat.

If you're looking for a more indulgent option, consider stuffing the cookies with a dollop of Nutella or your favorite filling before baking. Just make a small indentation in the center of each dollop of dough, add a teaspoon of filling, and top with a little more dough. This technique will create a lovely surprise in each bite, turning a simple cookie into a rich delight!

Questions About Recipes

→ Can I use natural peanut butter?

Yes, natural peanut butter works, but the cookies may spread more during baking.

→ Can I make these cookies gluten-free?

You can use a gluten-free brownie mix to make these cookies suitable for a gluten-free diet.

→ How do I store the cookies?

Store them in an airtight container at room temperature for up to a week.

→ Can I freeze the cookie dough?

Absolutely! You can freeze the dough before baking for up to three months. Just thaw it in the refrigerator before baking.

Brownie Mix Peanut Butter Cookies

I absolutely love baking, and these Brownie Mix Peanut Butter Cookies bring together two of my favorite treats in one delightful bite. The chewy texture of brownie mix combined with the creamy richness of peanut butter creates a unique cookie that's not overly sweet yet totally satisfying. Whether you need a quick treat for guests or a simple dessert for the family, these cookies are a go-to in my kitchen. Plus, they come together in a flash, so you can indulge without spending hours in the kitchen!

Prep Time10 minutes
Cooking Duration15 minutes
Overall Time25 minutes

Created by: Lillian Hayes

Recipe Type: Oven-Kissed Treats

Skill Level: Easy

Final Quantity: 12 cookies

What You'll Need

Ingredients

  1. 1 box brownie mix (about 18.4 oz)
  2. 1/2 cup peanut butter
  3. 1 large egg
  4. 1/4 cup vegetable oil
  5. 1/2 cup chocolate chips (optional)
  6. Sea salt for sprinkling (optional)

How-To Steps

Step 01

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

Step 02

In a large mixing bowl, combine the brownie mix, peanut butter, egg, and vegetable oil. Stir until just combined, being careful not to overmix.

Step 03

If using, fold in the chocolate chips to the cookie dough for an extra chocolatey burst.

Step 04

Using a tablespoon or cookie scoop, drop dollops of dough onto the prepared baking sheet, spacing them about 2 inches apart.

Step 05

If desired, sprinkle a pinch of sea salt on top of each cookie for added flavor.

Step 06

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

Step 07

Allow the cookies to cool on the baking sheet for a few minutes before transferring them to a wire rack. Enjoy them warm or at room temperature!

Extra Tips

  1. For extra decadence, try adding chopped nuts or using flavored peanut butter. You can also experiment with different types of brownie mixes for unique flavors.

Nutritional Breakdown (Per Serving)

  • Calories: 180 kcal
  • Total Fat: 10g
  • Saturated Fat: 2.5g
  • Cholesterol: 25mg
  • Sodium: 95mg
  • Total Carbohydrates: 22g
  • Dietary Fiber: 1g
  • Sugars: 12g
  • Protein: 4g