Frost cupcakes with Cadbury Crème Egg Frosting for glossy, chocolate-speckled swirls—fun, nostalgic, and easy to make.
Cut the unsalted butter into even tablespoon-sized pieces and place them in a roomy matte grey ceramic mixing bowl. Using the paddle attachment (or a sturdy spatula if hand-mixing), beat the butter on medium-high until it becomes noticeably paler, airy and silky — about 5–7 minutes. Scrape down the bowl occasionally so the texture stays uniformly light and not streaky; you want a smooth, ribbon-like butter base that feels aerated and silky to the touch.
With the mixer or spatula on low, add two cups of powdered sugar to the aerated butter and fold until fully incorporated and no dry pockets remain. Add the teaspoon of pure vanilla extract and beat for another minute so the aroma blooms and the mixture becomes slightly denser but still creamy. The texture at this stage should be thick, slightly tacky, and homogeneous — a clean buttercream foundation.
Add the remaining three cups of powdered sugar along with two tablespoons of heavy cream (or milk) a little at a time, mixing on low until the sugar is dampened, then increase to medium-high and beat until the frosting is glossy, smooth, and fluffy — about three minutes. The finished frosting should hold soft peaks, feel velvety on the spatula, and glide when spread; it’s the moment the buttercream transforms into a pipeable, stable consistency.
Unwrap the Cadbury Crème Eggs and cut each in half. Add the halves to the frosting one at a time, pressing them briefly into the buttercream so the shell and molten center break up and distribute. Continue to stir on medium-high just long enough for the chocolate shells to fracture into small flecks while leaving hints of the creamy yellow-and-white fondant swirls; the result is a pale buttercream speckled with glossy chocolate shards and occasional oozing bits of crème.

Check the frosting consistency; if it reads too thick for piping, fold in an extra teaspoon or two of heavy cream until it loosens to a glossy, easily pipeable flow. If it becomes too loose, briefly chill to firm up. The frosting should be dense enough to hold a tall swirl but supple enough to show the chocolate flecks and ribbons of fondant inside.
Using a large open round piping tip or an offset spatula, pipe or spread generous swirls of the Cadbury-studded frosting onto each prepared cupcake. Top each swirl with a halved Crème Egg, set slightly angled so the cracked shell and gooey center are visible, and scatter Easter sprinkles or mini Cadbury eggs around the base for a playful finish. Arrange on a small white pedestal stand for an inviting presentation that highlights the glossy frosting, chocolate flecks, and molten egg center.
