Reese’s Geode Cake

every good trend has its spin-offs...

and this Reese's Geode cake is one of them! Geode cakes have been huuugely popular on the Pinterest and Instagram channels that I follow for a good while now….and every cool trend has its spin-offs, right?

I love the way geode style cakes look, but honestly – the rock candy they’re made with doesn’t really taste ALL that good, does it? Sooo….why not replace it with something that does?

The Reese’s Pieces and box on the top give it a super fun pop of color, and it looks gorgeous on the inside too! This cakes combines several of my favorite cake styles – geode, drip, and anti-gravity – all into one! Recipe and instructions below!!

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Reese's Geode Cake layers:

2 ¼ cups (350g) all purpose flour
2 ¼ cups (450g) granulated sugar
1 ¼ cup (100g) cocoa powder
1 tsp baking soda
¾ tsp salt
1 c /250g /16 T unsalted butter, softened
4 large eggs, at room temperature
1 ½ cups (350mL) buttermilk (buttermilk powder with water is an option if you can’t find liquid buttermilk at your grocery store!)
2 tsp vanilla extract

Of'll need a kitchen scale if you want to measure ingredients in grams.


Preheat an oven to 350 degrees F (180C) or 320 FC (160C) for a convection oven. Grease 3 8-inch cake pans with baker's floured spray and/or line pans with parchment rounds

In the bowl of a stand mixer with the paddle attachment, add the cocoa powder, flour, salt, baking soda, and sugar. Turn mixer on low speed and allow it to mix for a couple minutes to help everything combine well (or sift the ingredients together). Add in the softened butter until it’s well incorporated into the dry ingredients and no lumps of butter are visible. 

Add buttermilk, eggs, and vanilla together and whisk until well combined. Add wet ingredients to dry ingredients and mix no dry ingredients are visible. Scrape down the bowl and beat for another 20 seconds.

Fill the three pans evenly - I find a kitchen scale helpful for this part, and each of mine weighed out to about 550g. Bake for 30-35 min or until a toothpick inserted comes out clean. Allow cake layers to cool for 10-15 minutes on a wire cooling rack before removing from pans, and cool completely before frosting. Set in the fridge or freezer to accelerate the cooling process if desired.

This is a great time to start prepping your frosting and ganache for the filling and drip!

Peanut Butter Frosting:
8 oz (one package) cream cheese, softened
16 Tablespoons (two sticks) butter, softened
1 c (8oz) creamy peanut butter
7-8 c powdered sugar
2-4 Tablespoons milk

Beat together softened cream cheese and butter; beat in peanut butter until thoroughly combined. Slowly add in powdered sugar alternating with milk until frosting reaches desired consistency.

Chocolate ganache (for filling and drip):
6 oz (1 cup) semisweet chocolate chips
6 oz (3/4 cup) heavy whipping cream
Meanwhile, make your ganache. Place chocolate chips in a heat-proof bowl. Add whipping cream and microwave on half power in 30-second intervals, stirring in between until smooth. 

Additional Supplies/Equipment:
- 1 8- or 10 -inch cardboard cake circle (I prefer Wilton’s center-punched circles)
- Small piping bag & star tip – this set has been one of my favorites for 3+ years now!
- small paring knife (to make the geode cut) 
- 1 Reese’s Pieces candy box (I emptied mine out to make it easier to work with) 
- 1 long skewer (or a chopstick, or a straw, or anything long and thin enough to use to make the box stay up on top of the cake!) 
- 1 large bag Reese’s pieces candy 
- ½ c chocolate chips (I used semisweet chocolate chips
- small piping bag or drip bottle or spoon for adding your chocolate ganache drip
Cake leveler, cake turntable, large offset spatula, and pastry cutter/bench scraper - not all 100% necessary but incredibly helpful! (Here’s a link to the cake turntable I use)

Of note, when working with peanut butter frosting, I actually found plastic knives, spatulas, and scrapers to work best with the frosting! No idea why, but they did. My metal ones all just stuck and pulled the frosting apart.

Once your cake layers are cool, level them (if needed/desired). This can be done with a cake leveler or a large serrated knife and a ruler.
(Option! I mashed the cake tops with a bit of frosting to make a ‘cake pop’ mix; I wanted the Reese’s box to stand a bit taller above my cake than it would have otherwise – so I mounded some chocolate cake pop mix on top of the cake while I was decorating. Make the cake pop mix now if you want to do this…. otherwise you can just eat the cake tops! 😉 ) 

Place a smear of frosting on your cake circle (to keep the cake from sliding while you decorate it) and center your first cake layer in the center of the circle. Spread the layer with frosting. Pipe a border of frosting around the edge of the cake to keep the filling inside, and sprinkle the layer with chocolate chips, Reese’s pieces, and drizzle with chocolate ganache to your liking!
Repeat the process with your remaining cake layers.

Now you're ready to crumb-coat . If you're unfamiliar with crumb-coating, it's just what it sounds like – spreading a thin layer of frosting over the entire outside of the cake to keep crumbs out of your final layer.
Once your crumb coat has set (this takes about 5-10 minutes in the fridge), add your final layer of frosting and smooth. I used a small plastic knife and plastic bench scraper for this part. Once your cake is covered, place it into the fridge or freezer to set the frosting.


Take the small paring knife and cut a slanted slice out of the cake – check out about 0:12 of my video if you’re unsure how to make the cut! With a small spatula or knife, crumb coat the inside of the cut you just made, and press Reeses Pieces into the frosting, filling your ‘geode’ cut in the cake.

Okaaaay......the drip!

When your ganache has cooled to a moderate temperature – it should feel slightly warm and still be fairly liquid – transfer it to a squeeze bottle or piping bag. A spoon will work if you don’t have either of those, I’ve just found spoons to be a tiny bit more difficult to work with.
Slowly drizzle ganache around the upper edge of your cake, pausing every inch or so to let ganache fall in a drip down the side of the cake. Return cake to the fridge or freezer to set the drips.

If you’ve mashed your cake tops into cake pop mix, now’s the time to mound about ½- ¾ c of that mix on top of the cake – this will hold the box up higher off the top of the cake and make it look more dramatic! You can skip this step if you’d rather.


Open the box of Reese’s Pieces and insert your skewer (or straw, or whatever) into the box. I cut a side tab off so that I could close the box, but you could also leave all four tabs open. Invert the box and press the skewer down through the cake pop mix mound into the top of the cake.

Pipe peanut butter frosting in small swirls around the upper rim of your cake – this will help hold the Reese’s pieces in place! Pile Reese’s pieces candy around the box on top of the cake, making sure to cover the mound of cake pop mix and the frosting on top of the cake. I used a tiny bit of extra ganache to make some of them stick down close to the geode cut so they wouldn’t spill off the top of the cake.

Annnd you’re done! Step back and admire your kick-butt cake!

Make this recipe? Let me know how it went – or make my day and find me on Pinterest or on Instagram and tag @IntensiveCakeUnit in your photo!

4 thoughts on “Reese’s Geode Cake

  1. This cake turned out so good! The frosting was to die for and the cake was moist and fluffy! I followed the directions exactly and followed the grams measurements for the flour and sugar. Would definitely recommend!

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