Why You’ll Love Reese’s Peanut Butter Cup Brownies Recipe

This dessert takes classic brownies to the next level with layers of peanut butter cup goodness and a silky frosting that makes every bite indulgent. You’ll love how simple it is to whip up with everyday ingredients and how well it satisfies both chocolate and peanut butter cravings.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

Brownie base

brownie mix (9×13‑inch size), plus ingredients called for on the box
Reese’s Peanut Butter Cups (full‑size)

Frosting

creamy peanut butter
unsalted butter, room temperature
confectioners sugar
heavy cream
vanilla extract

Optional toppings

chopped Reese’s Cups
chocolate drizzle
Reese’s Pieces

Directions

Preheat your oven to 350°F (175°C). Line a 9×13‑inch baking pan with parchment paper and set aside.
Prepare the boxed brownie mix according to the package instructions. Spread about two‑thirds of the batter evenly in the prepared pan.
Arrange the whole Reese’s Peanut Butter Cups in a single layer over the batter. Gently cover with the remaining brownie batter.
Bake for 25–30 minutes, or until a toothpick inserted in the center comes out with moist crumbs but no wet batter. Let cool completely.
Meanwhile, make the frosting by beating together the creamy peanut butter and softened butter until smooth.
Gradually mix in the confectioners sugar. Add heavy cream and vanilla, then whip until light and fluffy.
Spread the frosting over the cooled brownies. If desired, top with chopped Reese’s Cups or a drizzle of melted chocolate.
Slice and serve.

Servings and timing

Servings: 15
Prep time: 10 minutes
Cook time: 30 minutes
Total time: 40 minutes

Variations

Homemade Brownie Base: Use your favorite from-scratch brownie recipe instead of a boxed mix.
Double Peanut Butter: Add peanut butter chips to the brownie batter for an extra layer of flavor.
Crunchy Texture: Mix chopped nuts into the frosting or sprinkle them on top.
Mini Versions: Use a muffin tin to make individual brownie cups with mini Reese’s inside.
Chocolate Frosting Swap: Replace the peanut butter frosting with chocolate buttercream for a rich twist.

Storage/Reheating

Store leftover brownies in an airtight container at room temperature for up to 2 days, or refrigerate for up to 4 days. You can also freeze frosted brownies for up to 3 months; flash freeze first so the frosting stiffens, then wrap and store in a freezer‑safe container. Thaw at room temperature before serving.

FAQs

How do I prevent the frosting from being too runny?

Make sure the brownies are completely cool before frosting. If the frosting seems loose, add a bit more confectioners sugar to thicken it.

Can I make this recipe without a boxed mix?

Yes, you can substitute a homemade brownie recipe of similar yield, which will work just as well.

What size pan should I use?

A standard 9×13‑inch baking pan gives you the correct thickness for baking and layering the Reese’s Cups.

Can I use mini Reese’s Cups instead of full‑size?

Yes, mini Reese’s can be used for smaller pockets of peanut butter in every bite.

Do I have to frost these brownies?

While the peanut butter frosting adds richness, you can skip it if you prefer a simpler version.

Can I add extra chocolate toppings?

Yes, a drizzle of melted chocolate or sprinkle of mini chocolate chips adds extra decadence.

How do I know when the brownies are done?

A toothpick inserted in the center should come out with a few moist crumbs, but not wet batter.

Can I make these ahead of time?

Yes, you can bake and frost them a day ahead. Store covered in the refrigerator until ready to serve.

Are these brownies gluten‑free?

Not as written; to make them gluten‑free, use a gluten‑free brownie mix.

Can I freeze the brownies?

Yes, frosted brownies can be frozen for up to 3 months. Thaw before serving.

Conclusion

These Reese’s Peanut Butter Cup Brownies bring together fudgy chocolate, gooey Reese’s Cups, and creamy peanut butter frosting in one spectacular dessert. Easy to make and even easier to love, they’re sure to become a go‑to for celebrations or any time you need a rich, crowd‑pleasing treat.