Sprinkle yeast over warm water (110 degrees, about 50 sec in the microwave) and let the yeast activate for 5 minutes.
Cream butter and sugar. Then add the eggs and salt.
Add the activated yeast and flour into the creamed butter mixture. Knead with dough attachment in a stand mixer, or on the counter until the dough is smooth
Place the dough in a greased bowl, and let it rise until it has doubled.
Once the dough has risen, roll out into a 1/4 inch thick sheet. Cut into rectangle shapes.
Let the cut rectangle dough rise for another 1 hour.
After the dough has risen for a second time, fry in oil. Use a candy theremometer to make sure the oil stays at or around 375 degrees. Fry for 1 minute, then flip over the donut and fry for 1 more minute.
Remove the doughnut from the oil, onto a paper towel to remove excess grease.
Allow the doughnuts to cool slightly before frosting.
FROSTING
Mix approx 1 1/2 cups of powdered sugar, and 2 Tbs of hot water, and 10 drops of maple extract to make the maple glaze.
Notes
A candy thermometer is very useful, as it lets you know the exact temperature of the oil. Sometimes dough can cool down the oil, causing the doughnuts not to cook properly!