Instructions Place warm milk, yeast, and sugar into your mixer and proof for 10 minutes until foamy. Add flour, salt, butter, and egg yolks to the mixer and mix on medium speed for 3-5 minutes, or until a dough ball is formed and well combined. Remove dough to a lightly oiled bowl, turn to coat, cover and let rise for 1 hour. Roll out dough on a well-floured surface to 1/2 inch in thickness. Cut into large rectangles using a pizza cutter or large knife. Remove individual rectangles to a prepped surface (details above) to rise for 30 minutes. Make icing while donuts are rising by mixing 1 pound of powdered sugar, 1/4 cup pure maple syrup, 1/4 tsp salt, 1/4 tsp vanilla, 1 tsp maple extract, and enough hot water to make it a pourable, dippable consistency. Preheat oil in a heavy bottomed pan to 350 degrees. After 30 minutes of rise time, fry the donuts in batches, about 1-2 minutes per side, and remove to a paper towel lined sheet to cool. While still warm, dip in icing and place on sheet to dry. Double dip after completely cooled for a thicker coat of icing.