Whisk together the flour, baking powder, salt, sugar and cinnamon.
Chop the cold butter with a knife into small bits and add it to the dry ingredients. Using a pastry knife, cut it into the flour until you have small, dime or black bean sized bits of butter. Use your fingers to rub the mixture between your fingers and thumbs to ensure there’s no giant bits of butter left.
Mash the banana with a fork and add it to the bowl. Whisk together the vanilla and heavy cream and pour them into the bowl. Add the nuts if using. Use a rubber spatula to stir the dough then switch to using your hands.
We want to gather the dough together in a ball without ‘kneading’ it so scoop the dough from the sides of the bowl and fold them over onto the center, squeezing gently to encourage it to adhere. (see the video for visual guidance) Keep doing this until the dough comes together in a shaggy ball.
On a floured surface press or roll the dough into a 9x7” ish rectangle then fold it over itself. Repeat. Press the dough into a circle that’s about 1 inch thickness. Slice the dough into 8 wedges.
Set the scones on a small baking tray (baking them close together helps them rise higher) and freeze for an hour. If you’d like to keep them longer in the freezer, transfer them to an airtight container.
Preheat the oven to 375 F. If you are doing a sugar topping, brush the scones with heavy cream and sprinkle with sugar.
Bake the scones for about 18-20 minutes, until dark golden on the edges and you can’t spot any ‘doughy’ bits in the center.
If you’ll be glazing the scones, wait until they are completely cool.