01 - In the bowl of a stand mixer, combine all-purpose flour, granulated sugar, salt, and instant yeast.
02 - Add warm milk and the egg to the dry mixture. Mix on low speed until a cohesive dough forms. Incorporate softened butter and knead for 6 to 8 minutes until smooth and elastic.
03 - Transfer dough to a greased bowl, cover, and let proof in a warm area for 1 hour or until doubled in volume.
04 - Line a 12-cup muffin tin with parchment paper strips to facilitate removal.
05 - Punch down dough and divide into 2 equal portions. Roll each half into a thin rectangle approximately 12 by 15 inches.
06 - Evenly spread half of the softened butter over each rectangle.
07 - Starting from the long edge, tightly roll up each rectangle to form a log.
08 - Slice each log lengthwise to expose layers, creating 4 strips per log. With the cut sides facing outward, coil each strip into a spiral and tuck the end underneath.
09 - Place each spiral into the prepared muffin tin. Cover loosely and let rise for 30 to 45 minutes until puffy.
10 - Preheat oven to 375°F.
11 - Bake for 20 to 25 minutes or until golden brown and fully baked.
12 - Allow cruffins to cool in the pan for 5 minutes, then transfer to a wire rack.
13 - While cruffins are still warm, brush each with melted butter and roll in cinnamon sugar mixture.