In a mixing bowl, whisk together the flour, salt, baking powder, and cinnamon. In a separate bowl, whisk together the egg, milk, maple, and vanilla extract.
Cut the butter into very small cubes and mix into flour. Then, make a well in the middle of the flour and pour in the wet ingredients. Mix until just combined (do not over-mix!).
Transfer dough to a floured surface, lightly flour your hands, and separate the dough in two equal parts. Lightly knead and form each into a circle, about 1 1/4 inch thick. Cut each circle into 8 equal pieces.
Place the 16 mini scones on a baking sheet lined with parchment paper. Freeze for 20 minutes. While freezing, preheat oven to 400 degrees F.
Lightly brush each scone with milk. Bake for 13-15 minutes. Let cool completely.
Mix together glaze ingredients. Dip scones one at a time in glaze and place on cooling rack with foil or paper towel under it to catch any excess glaze.