Add pumpkin puree and mix until smooth. Set aside.
Mix the flour, baking powder, baking soda, cinnamon powder and salt in a large bowl.
Fold in wet ingredients into the dry ingredients with a spatula. The dough will be very soft. Cover the dough with cling wrap and chill for 30 minutes.
Preheat oven to 350°Line a baking tray with parchment paper.
Roll the dough into balls. Flatten each ball slightly with your hands. Make a cross design on top with a knife. Press crushed pistachio in the center.
Bake for 15 minutes or until the edges appear set .