You will find pure bliss within each bite of these Reeses stuffed brownies. A fudgy brownie stuffed with Reese’s peanut butter cups and then topped with a creamy peanut butter frosting. Dangerously delicious!

Reeses Stuffed Brownies cut into squares and placed on a tray with candy sprinkled around the plate

I admit I am obsessed with peanut butter and chocolate, so these loaded brownies just hit my soul in a whole new way. For another peanut butter version, you have to try my Buckeye brownies. Or step out of the box and try my German chocolate brownies.

Reeses Stuffed Brownie on a spatula above table where more brownies are sitting

What Are Reese’s Stuffed Brownies

These brownies are just like they sound. You take a boxed brownie mix,, whip it up, stuff it with peanut butter cups, and bake it as directed.

Once baked and cooled, you spread on this thick, velvety, smooth peanut butter frosting. Then, top with extra chopped peanut butter cups and dive in.

Reeses Stuffed Brownies sliced into squares and placed on a round plate on table

Reason You Will Love These Reeses Brownies

This is an effortless and no-fuss-style dessert. These brownies take minimal effort to make.
You get the flavors of chocolate and peanut butter in each bite.
It’s a fun and tasty way to dress a box of brownies into a new level of yum.
The peanut butter frosting is one thing that makes this dessert go to a whole new level of yum.

ingredients for Reeses Stuffed Brownies sitting in containers on table

Ingredients You Will Need

Brownies – I used boxed brownies to speed up the prep. You will also use all the ingredients needed on the back of the box.

Reese’s – Peanut butter cups are simply the star if this dessert. I reached for full-size Reese’s.

Peanut Butter—I wanted the frosting to be peanut butter-flavored, so I used creamy peanut butter as the base.

Butter—Use softened butter to help create a rich and velvety texture in the frosting.

Powdered Sugar—Powdered sugar is the thickening agent for the frosting. If you find clumps, sift it.

Heavy Cream—Add some heavy cream to the frosting to thin it out and help create a stunning creamy texture.

Vanilla – A splash of vanilla is used to help elevate the flavor of the frosting.

brownie mix in a bowl with egg and oil in it on the sides

glass bowl of wet brownie batter with a wooden spoon sitting in it

Variations and Substitutes

You can swap the Reese’s peanut butter cups for a different type of chocolate—Snickers, Rolos, Twix, etc.
Sprinkle some mini chocolate or peanut butter chips on the brownie mix for added sweetness.
To elevate the flavor, drizzle the top of the frosting with caramel, hot fudge, or even chocolate sauce.
You can crush pretzels or peanuts and sprinkle them over the frosted brownies, or you can mix them in the brownie batter before baking.
Make this recipe with homemade brownies in replacement for a boxed brownie.
You can skip adding the frosting if you prefer less in the brownies.

Reeses Stuffed Brownies on a plate with one brownie with a bite taken out of it

Tips For Making Reese’s Stuffed Brownies

Start with a prepared pan sprayed with cooking spray or even lined with parchment paper.

After you place Reese’s cups in the brownie mix, lightly press it down in the batter. Don’t push too deep enough to get them into the brownie mix.

Reeses Stuffed Brownies on a plate with a container of Reese's in the background and a glass of milk

These need to be baked a little longer than the box directions state; adding the peanut butter cups makes the brownies thicker, so added baking time is needed.

Watch the cooking time and make sure you do not overbake the brownies. When you stick a toothpick in the brownie mixture, your brownies are done, and it comes out clean of wet brownie batter.

Allow the brownies to cool before you frost them fully. Otherwise, the frosting will melt into the brownies.

close up of brownies sliced into squares sitting on table with milk jug to side and Reeses scattered on plate

Storing Brownies

You can store the brownies at room temperature for 3-4 days or refrigerate them for 6-7 days to extend their life.

The other option is freezing any brownies you do not plan to eat immediately. They can be frozen in a freezer-friendly container for up to 3 months. Then eat straight from the freezer or thaw on the counter or in the fridge overnight.

close up of a frosting Reeses Stuffed Brownie on table with mini chocolate chips and chopped peanut butter cups spread over table

FAQs

Can I use homemade brownies instead of a boxed mix?

Yes, if you prefer a homemade brownie batter, go for it. Mix and bake as directed. I would add a couple extra minutes to the baking time to ensure the brownies thoroughly bake through.

Reeses Stuffed Brownies on a plate with a jug of milk and Reeses package in the background

Can I use mini Reese’s cups instead of full-sized ones?

Of course. You can use smaller Reese cups or chop them up and sprinkle in the brownie mixture. Just lightly press into the batter as you would the full size.

spatula with a peanut butter cup brownie on it above table where more brownies are sliced and plated up

What can I substitute for heavy cream in the frosting?

Milk or even half-and-half can replace the heavy cream in the peanut butter frosting. It will reduce the richness of the frosting but work just as well.