Add you dry ingredients into a medium sized bowl and stir to combine.
Measure out the wet ingredients in a small bowl and add into the dry.
Add in the grated apple and stir until the donut batter just forms together. Do not over mix!
Add mixture into a zliplock bag and cut the tip off of one of the corners of the bag to create your own piping bag. Fill the greased donut pan with the batter. Should give you 6 evenly filled donuts.
Cook at 350 degrees for 10-12 minutes or until they are set and golden brown. Let cool slightly.
Melt 1 TBSP of butter in a small dish. On a small plate combine 1/2 cup of sugar and 1 TBSP of ground cinnamon and mix together. Brush a donut with melted butter and place in cinnamon sugar mixture to coat. You can do it on both sides or just one. Continue the the remaining donuts and enjoy!