Preheat oven to 350F and line two baking sheets with parchment paper.
In a medium sized bowl whisk together flour, cornstarch, and salt. Set aside.
In a large bowl cream butter and powdered sugar until smooth.
Add in the vanilla, mix well.
Gradually add in the flour mixture and mix until well combined.
Take out 3 tbsp worth of dough and place in separate bowl, this dough will be used for the pumpkin stems. Add in the green food colouring and mix. tart with 1/4 tsp and keep adding more until you get the colour you desire.
In the large bowl add in the red and yellow food colouring. Start with 1 tsp red and 1/2 tsp yellow. Keep adding more food colouring until you get the orange colour you desire. Make sure the colouring is well mixed into the dough.
To assemble the pumpkins scoop out 1 & 1/2 tsp of the orange dough. Roll dough in your hands to make it smooth. In your hands, gently push down on the dough to flatten it slightly. Then with your thumb and index finger squish two parallel sides to create an oval shape. Place dough on the cookie sheet.
To form the pumpkin lines press the rounded section of a fork into the cookie. Do two indents on the right side, then turn fork and to do more indents on the left side (see picture above).
Pinch of a piece of the green dough and shape into a stem and stick it onto the top of the orange cookie.
Repeat this with the remaining cookies. Place them 2 inches apart of the baking sheet.
Bake for 11-13 minutes or until bottoms are golden brown.
Allow them to cool on the pan completely before moving.
Store at room temperature in an airtight container.
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