Preheat an oven to 350°F.
In a standing mixer or bowl, beat the butter and sugar until light and fluffy, about 2 minutes.
Add the egg, orange and vanilla extracts and zest and mix until well incorporated.
Add the flour and salt and mix until combined.
Scoop the dough out onto a large, 18-inch piece of parchment paper and shape the dough into a 14-inch long, 1½-inch round log.
Wrap the dough in parchment and gently roll the dough back and forth on the counter to round out the edges of the dough, making a perfectly round cylinder.
Refrigerate the dough for one hour.
After an hour, remove the dough from the refrigerator and unwrap (but leave the dough on the parchment paper).
Evenly sprinkle the dough with poppy seeds, rolling and pressing the dough into the seeds until the dough log is completely coated.
Slice the log into ¼-inch round cookies and place on baking sheets that have been lined with parchment paper. Bake the cookies for 10-12 minutes or until slightly golden brown.
This recipe makes 36 cookies.