01 -
Line an 8-inch square pan with parchment paper, leaving overhang on two sides. Lightly grease the parchment if it does not sit flat.
02 -
Beat the softened butter, corn syrup, vanilla, powdered sugar, milk, and salt until smooth and thick. Move about one-third to a small bowl and tint it yellow with gel food coloring.
03 -
Combine both chocolates, sweetened condensed milk, butter, and salt in a microwave-safe bowl. Heat in 20-second bursts, stirring after each, until smooth and glossy.
04 -
Spread half of the warm chocolate fudge evenly in the prepared pan. Chill for 10 minutes, keeping the remaining chocolate mixture warm and spreadable.
05 -
Spread the white filling over the chocolate base. Dollop the yellow filling over it and swirl lightly with a knife without fully blending the colors.
06 -
Spread the remaining chocolate fudge over the creme layer. Press chilled Cadbury Creme Egg pieces over the top, then refrigerate for at least 2 hours until firm.
07 -
Lift the slab from the pan. Cut into small squares with a hot dry knife, wiping the blade between cuts for clean layers.