1: Prepare the white cake mix according to the package instructions.
2: Divide the cake batter and color with red and green food dye.
3: Pour the batter into a greased baking sheet and spread evenly.
4: Bake according to the cake mix package instructions and let it cool.
5: While cooling, prepare the buttercream by mixing softened butter, powdered sugar, vanilla, and milk until smooth.
6: Once the cake is cool, spread the buttercream over the top and then roll it up to form the cake roll.
7: Slice and serve for a festive treat!
