Mash bananas then add yogurt. Set aside.
In large bowl, combine flours, sugar, baking powder, salt and cinnamon. Whisk until well combined. Using a pastry cutter, a fork, or your fingers, cut in the butter until there are no pieces of butter larger than a pea.
Add banana/yogurt mixture to flour and stir until just combined.
On a cutting board lined with wax paper, turn dough out on top. Pat it into a disk about 1" thick then cover with another piece of wax paper. Place in freezer for 30 minutes.
Preheat oven to 400 degrees. Once ready to bake, peel off top layer of wax paper then invert onto a parchment paper lined baking sheet. Peel off second layer. Cut disc into 8 triangular scones, then pull them apart about 1 inch from each other to give them room to bake. Bake in preheated oven 25-30 minutes, until the scones are golden brown.
While scones are baking, make the glaze by whisking together the melted butter, milk, maple syrup, vanilla, and powdered sugar until smooth.
Drizzle scones with glaze. Enjoy!
Note:For scones that are not going to be eaten right away, keep un-glazed until ready to eat, otherwise they may get soggy.