Beat the butter on medium speed until creamy, about 2 minutes.
Add confectioners’ sugar, heavy cream, and vanilla on low.
Raise to high and beat 3 mins.
Crumble the cooled cake into the bowl on top of the frosting.
Make sure there are no large lumps.
Turn to low and combine the two.
At this point you divide it into cups/bowls evenly and dye each one the color you want.
Line a loaf pan with nonstick foil.
Press in one color along the bottom and top with a thin layer of raspberry jam. Repeat with each color, spreading jam between each color. Cover and pop in freezer over night.