Geode Cake (teal)

Geode Cake

So - all of that said - if you’re reading this with plans to make a geode cake you’re way ahead of me! 😉  

Learn from my mistakes and color the rock candy AFTER you put it on the cake! 

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Geode Cake

Want to know how to make a deliciously gorgeous trendy geode cake? Recipe, tools, tips, and tricks inside!
Prep Time30 minutes
Cook Time37 minutes
Decorating time1 hour
Total Time2 hours 7 minutes
Course: Dessert
Cuisine: American
Keyword: Geode Cake, Geode Cake Tutorial, Make a Geode Cake
Servings: 16 servings
Calories: 769kcal
Author: Sarah H

Ingredients

Geode Cake Layers

  • 3 ¼ cup all-purpose flour
  • 3 cup granulated sugar
  • 2 ½ teaspoon baking powder
  • 1 teaspoon salt
  • 1 cup unsalted butter or 2 sticks room temperature
  • 1 ½ cups buttermilk room temperature
  • 5 eggs
  • 2 teaspoons clear vanilla extract

Cream Cheese Buttercream Frosting

  • 8 ounces cream cheese one package; softened
  • 1 cup butter two sticks, softened
  • 6 cups powdered sugar
  • 2-4 Tablespoons milk
  • 1 Tablespoon clear vanilla extract
  • ¼ teaspoon salt if using unsalted butter
  • 3-4 drops teal gel food coloring optional; save and add later for cake filling

Geode / Decorations

Instructions

Geode Cake Layers

  • Preheat oven to 350°F. Prepare three 8 inch round pans with baker's floured spray (or grease and line with parchment rounds).
  • Mix together all dry ingredients (flour, sugar, baking powder, and salt) in a stand mixer with a paddle until fully combined. Mix chunks of room-temperature butter slowly into the dry mix, on a low speed. Continue to mix until no large chunks of butter remain, and the mixture becomes crumbly.
  • Pour in eggs and mix on low until just incorporated. Mix in the buttermilk and vanilla on a low speed until fully incorporated. Scrape down the sides of the bowl with a spatula, then beat on medium speed for about 30 seconds.
  • Divide batter evenly between the prepared cake pans (I find a kitchen scale helpful for this part). This guarantees your layers will bake to be the same height.
  • Bake for 34-37 minutes (or until a toothpick comes out clean). Allow cake layers to cool for 10-15 minutes on a wire cooling rack before removing from pans. Cool completely before frosting. Set in the fridge or freezer to accelerate the cooling process if desired. (This is a great time to make your frosting!)
  • Once the layers have fully cooled, the caramelized bits can be trimmed from the sides / top of the cake using a serrated knife if desired. Be sure the layers are completely cooled or chilled before trimming. If you try to trim the layers while they’re still warm, they will crumble apart.

Cream Cheese Buttercream Frosting

  • Beat together softened cream cheese and butter; slowly add in powdered sugar alternating with milk until frosting reaches desired consistency. Add vanilla and salt if needed and beat until well combined.

Assembly

  • Once your cakes are cool, level them (if needed) Place a smear of frosting on your large cake circle (to keep the cake from sliding while you decorate it) and center your large first cake layer in the center of the circle. Spread the layer with frosting, or add a small ‘rim’ of white frosting and fill with teal frosting. Add your next cake layer on top, and 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 tiers 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 like to use a large offset spatula and pastry cutter/bench scraper for this part.
  • Now the FUN part! Carve your ‘geode’ shape! Cut an irregular shape out of the side of the cake - I shot for a few inches across at the widest point, but you can make the geode as wide or narrow as you choose.
  • With a small offset spatula, re-crumb-coat the geode ‘hole.’ This will keep crumbs in and hold your rock candy in place.
  • Press rock candy crystals into the frosting to cover the base of the geode ‘hole.’ (If your geode is very narrow, tweezers may help to place candy in the deepest parts.)
  • To color the geode, use a bit of teal gel color with a bit of vanilla extract (so it dries more quickly) and brush into the center/deepest part of the geode. Add a lot of color at the center and continue to thin the color with vanilla extract to make it progressively lighter toward the outer edges.
  • Rim the outside of the geode with bits of edible silver leaf – I tried a few methods for transferring it, because it’s fragile and a bit finicky. Tearing off and moving bits at a time with a dry paintbrush has been my favorite method so far!
  • Finish it off with a few extra pieces of silver leaf and some silk flowers if you’d like – and you’re done!

Video

Notes

Please note nutrition information is an estimate and may not be exactly accurate. 

Nutrition

Serving: 1slice | Calories: 769kcal | Carbohydrates: 100g | Protein: 9g | Fat: 37g

Mentioned in post - 
Cream Cheese Buttercream Frosting

Did you make a Geode cake, or have any comments or questions? 

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