Preheat oven to 350 degrees F. Line a baking sheet with parchment paper or a silicone mat and lightly spray with non-stick cooking spray.
In a smaller bowl, whisk together the egg, sour cream, vanilla extract, almond extract and baking soda. Let it sit for a minute. It will get fluffy.
In a large bowl whisk together the flour, sugar, baking powder, salt, cream of tartar, and cinnamon.
Using a pastry blender cut in cold butter cubes.
Stir in the sour cream mixture and fold together until just combined. The mixture will look dry and flaky, but you will find it will come together just perfectly.
Gently mix in the fresh mango.
Scrape the pile of dough out of the bowl on to a lightly floured surface and gently form the dough in to a circle and pat it down till it’s about 1-1/2 inches thick.
Cut each round in to 8 even size wedges and place the wedges on the prepared baking sheet.
Bake for 20-23 minutes or until the bottoms are just browned.