Preheat oven to 400 fdegrees; In a large bowl mix dry ingredients, add sweet potato puree and mix until the dough is mixed into a crumbly mixture. Add milk and stir until the dough is mixed together (the dough should be sticky but dry enough to work with). Place on a floured surface, kneading and forming a rectangle shape. Fold the corners of the rectangle into each other. Flatten it out and repeat the process. Cut the rectangle into six squares and cut the square into triangles. Place scones on a baking sheet lined with parchment paper and place in the oven for 10-20 minutes.