Preheat oven to 400°. Line 2 baking sheets with parchment paper
In a large bowl, whisk flour, salt and spices. Set aside
In a medium bowl, add brown sugar. Add butter cubes. Using your fingers, work brown sugar and butter together until the mixture is combined and crumbly. Set aside
In another bowl, whisk egg, yogurt, vanilla extract and pumpkin puree
Add brown sugar mixture to flour and stir well to combine.
Add pumpkin mixture to flour/sugar mixture and fold over and over until well combined. You want a stiff dough. If dough is too stiff, you can add a little milk, a teaspoon at a time.
Turn dough out onto a floured surface. With floured hands, pat down into a 7½x12 inch rectangle that is about 1/2 inch thick.
Cut rectangle long ways right down the middle, forming to strips.
Then cut into 6 equal squares.
Cut each square into 2 triangles.
Carefully move triangles to 2 parchment lined baking sheets.
Bake at 400° for 13 minutes. Remove to wire rack to cool completely