In a bowl, dissolve yeast and a teaspoon of sugar in warm milk. Let it sit until frothy.

In a large mixing bowl, combine softened butter, remaining sugar, salt, eggs, and vanilla; mix well.

Add the frothy yeast mixture and mix until combined.

Gradually add in the flour and cinnamon, and mix until a dough forms.

Knead the dough on a floured surface for about 5 minutes until smooth.

Place it in a greased bowl, cover with a towel, and let it rise in a warm place for about 1 hour until doubled in size.

Punch down the dough and roll it into a large rectangle.

Spread butter, sprinkle with cinnamon and sugar, and roll into a log.

Twist the log into a circular shape and place on a baking sheet.

Let it rise for another 30 minutes.

Preheat the oven to 350°F (175°C) and bake for about 25-30 minutes until golden brown.

Mix powdered sugar and milk to create icing and drizzle over the cooled cake.

Sprinkle colored sugars over the icing to decorate. Serve for Fat Tuesday!