Preheat the oven to 400F. Line a baking sheet with parchment paper.
In the bowl of your stand mixer fitted with the paddle attachment, combine the flour, brown sugar, baking powder, ground cinnamon, and salt. Mix for a few seconds on med-low to just combine dry ingredients. Add in the grated butter then mix on med-low until a crumble butter flour mixture comes together.
Add ½ cup heavy cream, melted peanut butter, egg, and vanilla extract to the bowl then mix again on med-low until it just combines. Finally, mix in the chocolate chips.
Dust a work surface with flour then pour scone dough out onto the surface. Using your hands, work the dough into a 10x6 inch rectangle then slice it into 12 equally sized squares. Place scone squares on the prepared baking sheet.
Brush the tops of the scones with the remaining 2 tbsps heavy cream then sprinkling coarse sugar ove top. Bake in the oven until golden, about 23-28 minutes.
While the scones are baking, make your glaze: Combine butter, peanut butter, and maple syrup in a small-med microwave safe bowl then microwave until melted, about 1 minute. Whisk in the powdered sugar, salt, and heavy cream until smooth.
Drizzle glaze over warm scones then add another sprinkle of coarse sugar and enjoy!