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This Valentine’s Day themed sprinkle fault line cake is made with homemade vanilla cake layers, simple vanilla buttercream, and loads of Valentine’s themed sprinkles!
If you’ve spent any time on Instagram in the last few months browsing cake photos, you would undoubtedly have come across some beautiful fault line cakes!
I was waiting for an occasion to jump on this trend, and with Valentine’s Day around the corner, how could I not?
The fault line
The fault line is just one of many cake trends that have made the rounds in the past year, especially on Instagram! If anyone knows who I should credit, let me know!
This unique trend keeps the sprinkles in the spotlight to glam and sparkle to your cake!
Let’s talk Sprinkles
The sprinkles make this look come to life!
I used a variety of sizes in the sprinkles around the theme of Valentine’s Day. You can choose to use a trendy sprinkle medley from suppliers like Sweetapolita, or even make your own sprinkle medley mix using a variety of sprinkles.
You only need about a 1/2 cup of sprinkles for a 4-inch cake like the recipe below.
Steps to assemble the fault line cake
I am by no means a cake expert. These are just the steps that I followed after referring to other sources, and this is the order of steps I followed to make this trend come to life!
Step #1: The Canvas – Start with a smooth and cold cake
Once you have crumb coated the cake, and put on your first layer of frosting, make sure to refrigerate the cake before moving onto the enxt step. This helps with sticking the sprinkles where they need to go, without getting mixed into the frosting!
Step #2: Separate the Sprinkles
I found that using smaller sprinkles as a base was easier to incorporate into the fault line cake. With bigger sprinkles, it’s hard to smooth on the outside layer of frosting.
Step #3: Outline your fault line
I used a bench scraper to mark where I wanted to create the outside of my fault line. Also, keep in mind to mark these points as bigger than you would initially think. The fault line will likely shrink as you smooth on the frosting.
Step #4: Stick the smaller sprinkles first
Working with a cold cake makes this step easy. To stick your sprinkles, I find it best to dip my fingertips in water before dipping them in sprinkles. It makes less of a mess, when moving the sprinkles from the bowl to the cake.
Tip: I placed the cake turntable on a baking sheet for this step to help catch any loose sprinkles. I still made a mess, but it helped!
Step #5: Frost and Smooth to create the fault line
Once the small sprinkles are on the cake you’re ready to frost the outside of the fault line. Pipe frosting on the top and bottom of the cake, and smooth it with a bench scraper or offset spatula on a turntable.
Tip: I preferred using a bench scraper for this cake, choose one that is at least as tall as the cake!
Step #6: Stick on the bigger sprinkles
Now that you’re happy with the look of your cake, finish the look with the bigger sprinkles. If the cake is a bit warm, put it back in the fridge before sticking on the big sprinkles.
Step #7: Paint the fault line edge
This is really an optional step, but I found that it really changes the look of the cake with the contrast of the metallic paint.
Make sure to use food safe / edible cake paint!
Tips to make the fault line sprinkle cake
Create a larger fault line than you would think
When you smooth the frosting, the two edges will likely come closer together!
Make sure to keep the cake cold
This was especially important when adding the sprinkles, and painting the edges of the fault line, because I used Swiss Meringue Buttercream. I imagine with American Buttercream or a crusting buttercream, this step might be less important.
Tools to create a sprinkle fault line cake
I order most of my cake making supplies from Amazon. These are the tools I used to create the look.
A cake turntable comes in really handy for this cake trend. It helps to be able to turn the cake around smoothly.
The turntable that i have and love is this one, and I got it on Amazon.
For most cakes, I find that both offset spatulas and bench scrapers work when smoothing the cake. For this cake in particular though, the bench scraper came in handy. Make sure to use a bench scraper that is at least as tall as the cake for best results!
I used this one from Ateco, and I find that the plastic handle helps with the grip, but that’s a personal preference!
As mentioned earlier, I created my own blend of sprinkles for this cake using a variety of sprinkle brands.
As part of the large sprinkles, I used the Wilton Jumbo Hearts
I used these Wilton Gold Sugar in my small sprinkle blend, among other sprinkles I got from Bulk Barn!
Edible rose gold paint
My favorite brand is this Sweet Sticks Metallic paint. I love that you don’t have to worry about mixing luster dust into alcohol or extract, which makes it an easy one step process.
I loved the contrast of pink with rose gold. Feel free to use any metallic color!
Alternatively, you can use any luster dust mixed in with some alcohol or extract as well!
There are a lot of amazing bakers who have some extremely inspirational designs. If you’re active on Instagram, checkout the hashtag #faultlinecake!
There are no bounds to creative combinations you can come up with on this fault line trend!
And there you have it! My take on the sprinkle fault line trend. If you give it a try, let me know!