Preheat oven to 350° F and apply a coating of non-stick baking spray to a donut pan.
Using a medium size mixing bowl, combine all the ingredients for the donuts and use a fork to mix thoroughly.
Use a spoon to transfer batter to the donut baking pan, evenly distributing it between six donut forms. Place in oven and bake for about 15 minutes or until a toothpick comes out clean, after inserting it.
Allow to cool about 15 minutes on cooling wrack. Meanwhile, prepare coating by melting butter in a bowl large enough to accommodate a donut. In separate bowl of same size, combine sugar and cinnamon for the coating process as well.
Remove donuts from pan and dip in butter, allow to drip for a minute and then roll in sugar and cinnamon mixture. Enjoy with a hot cup of coffee or a cold glass of milk.