Whisk together flour, cocoa powder, sugar, baking powder, salt and cinnamon in a large bowl.

In a small bowl, whisk together milk, egg, butter and vanilla. Pour the mixture into the flour mixture and stir together until combined, making sure not to overmix. Cover with plastic wrap and set in the refrigerator for 1 hour to rest.

Remove dough from the refrigerator and turn out onto a floured surface. Roll out until it's approximately 1/2" thick. Using a donut cutter or biscuit cutter, cut circles into the dough. Then use a small circular object to cut out the center - I used the wide end of a frosting tip.

In a large saucepan over medium heat, heat approximately 2 to 3" deep of oil until it reaches 365 degrees. Fry the donuts 2 to 3 at a time for approximately 2 minutes per side, until puffed and golden brown. Remove to a paper towel lined plate to drain. Repeat with remaining dough circles.

Stir together the powdered sugar, peanut butter, 1 Tbsp milk and 1/2 tsp vanilla for glaze in a small bowl until smooth.

Dunk each donut in the glaze, then cover with mini chocolate chips. Let set for about 10 to 15 minutes.