01 -
Mix sugar and cinnamon in a bowl until well combined.
02 -
Beat half the butter with sugar and salt until fluffy and light.
03 -
Mix in egg until just combined, then add milk and yeast.
04 -
Mix in flour until smooth, then beat for 3-4 minutes until elastic.
05 -
Fold in half the sprinkles until just mixed through.
06 -
Let dough rise in warm spot for 90 minutes.
07 -
Roll dough into rectangle, spread with remaining butter, add filling and sprinkles.
08 -
Roll into tight log and cut into 8 even pieces.
09 -
Place in buttered cast iron pan and refrigerate overnight.
10 -
Let rolls warm up and rise for 90 minutes next morning.
11 -
Bake at 325°F until golden brown, about 32-34 minutes.
12 -
Mix powdered sugar, milk and vanilla. Pour over warm rolls and top with extra sprinkles.