Preheat oven to 180C/350F/Gas 4 and line cupcake pan with 24 cupcake liners.

To make the cupcakes, place the cake mix, eggs, butter, and milk into a medium bowl and beat to combine using an electric mixer or by hand.

Stir in the patriotic jimmies.

Use an ice cream scoop to distribute the cupcake batter between the cupcake liners - about three-quarters full.

Bake for 20 minutes or until an inserted toothpick comes out clean.

Allow to cool for 5 minutes in the pan before transferring to a wire rack to cool completely.

To make the frosting use an electric mixer (standing or handheld). Place the butter, powdered sugar, cream, and vanilla into a mixing bowl, and mix on medium speed until combined and smooth.

Scoop 1½ cups of the frosting into another bowl and set aside.

Use an ice cream scoop to place a scoop of frosting onto each cooled cupcake.

Using a mini angled spatula, lightly spread and smooth evenly into a thick mound of frosting.

Pour the patriotic sprinkles into a bowl and dip the cupcake into the sprinkles to coat the frosting mound.

Using the frosting that was set aside, divide it between two bowls.

Mix red gel food coloring into one of the bowls of frosting to the desired shade.

Mix blue gel food coloring into one of the bowls of frosting to the desired shade.

Both colors of frosting will go inside one bag for a double-color swirl. Scoop the red frosting onto one side of the piping bag and scoop the blue frosting onto the other side of a large piping bag fitted with a star tip.

Pipe a swirl of the red and blue frosting combo onto the center of the cupcake.

Place the Unicorn Horn and Ears from the icing package into the frosting swirl.