Preheat oven to 400°F. While oven preheats, line a baking sheet with parchment paper.
In the bowl of a food processor (or large bowl if making by hand), combine all dry ingredients. Add cold butter to processor; pulse to cut in butter (or use hand-held pastry cutter). Process until mixture is crumbly and butter is about the size of peas.
In separate bowl, mix mashed banana, milk (or heavy cream), and egg; Mix until well blended. Add banana mixture to dry ingredients; pulse till dough comes together in a "shaggy" looking ball (If mixing by hand, stir till you have a "shaggy" looking dough ball). Turn dough ball onto a floured work surface; mix in nuts till blended.
With floured hands (sprinkle a bit more flour on dough, cause dough is sticky), gently form dough ball into a round "disc" approx. 8" across. Using sharp knife or pizza cutter, cut disc into 8 wedges.
Re-arrange wedges in a circle on prepared baking sheet. Brush scone tops with 1 TBSP of cream or milk; lightly sprinkle with sugar.
Bake scones at 400°F for 20-23 minutes (check them at the 20 minute mark-keep an eye on them). Bake till golden brown. When done, transfer scones to wire rack (with parchment or foil underneath to catch any drips from glaze icing). Let cool.
While cooling, mix glaze ingredients in small bowl. Once scones are completely cooled, "paint" icing over the scones using pastry brush. ENJOY!
Banana Nut Scones https://www.thegratefulgirlcooks.com/banana-nut-scones/