Activate the yeast

• Mix the lukewarm milk, yeast and sugar in a bowl.
• Let sit until foamy.

Make the dough

• Add the egg, melted butter and vanilla.
• Add the flour and salt and knead until soft and elastic.
• Add the purple and blue gel coloring little by little until deep violet-blue; the color deepens as it rests and bakes.

First rise

• Cover the dough and let rise in a warm place until doubled in size.

Fill and shape

• Roll the dough into a rectangle.
• Spread with softened butter and sprinkle evenly with brown sugar and cinnamon.
• Roll up tightly from the long side and cut into 6–8 buns.

Second rise

• Place the buns in a greased baking dish, cover and let rise.

Bake

• Bake at 175 °C until soft and fluffy; do not overbake.

Make the frosting

• Beat the cream cheese and butter until smooth.
• Add the powdered sugar, vanilla, salt and enough cream to make it thick but pipeable.
• Divide into two bowls and color one deep purple and the other dark blue.

Frost and serve

• Spread the two frostings slightly over the cooled buns.