Preheat the oven to 375°F. Spray a donut pan with nonstick oil spray and set aside.
In a large bowl, mix together the applesauce, eggs, Greek yogurt, oil, sugar, vanilla extract, and melted chocolate until smooth and creamy.
Then add the all-purpose flour, oat flour, cocoa powder, baking soda, baking powder and salt. Gently fold dry ingredients into wet until just combined (don’t overmix).
Add the batter into a piping bag or plastic bag and cut off the tip. Pipe or spoon batter into each cavity, filling until about ¾ full.
Bake for 15 minutes, until set and springy.
Cool in pan for 15 minutes, then transfer to a wire rack to cool completely.
Add the chocolate chips and coconut oil to a microwave-safe bowl. Microwave in 30-second intervals to melt the chocolate, mixing in between.
Dip the top of the donut in the chocolate and transfer to a wire cooling rack for the chocolate to harden. Let cool completely before serving.
