Preheat the oven to 350F and spray a 6 hole donut pan with some non stick cooking spray.
In a bowl, whisk the egg and brown sugar together until it becomes light and fluffy. Stir in the mashed banana, milk and vanilla.
Add the flour, PB2 powder and baking powder and mix well.
Divide the batter into the 6 donut hole slots, then bake for 16-18 minutes.
Let them cool, then remove the donuts from the pan using a knife around the edges.
In the microwave, melt the chocolate chips in 35 second intervals, stirring each time. I also melted them on a flat plate so it was easy to dip the donuts.
Once the chocolate is melted, dip each donut top into the chocolate. Use a knife if needed to help spread it.
Now microwave the peanut butter again for 35 seconds intervals. You may just need one set of 35 seconds. Then pour the melted PB into a small ziplock bag and cut off a tiny tip. Drizzle over each donut.
The chocolate and PB will harden after an hour or so. Enjoy!