Preheat oven to 350°F

In the bowl of a stand mixer, add butter and sugar. Mix until well blended, then add 1 egg and vanilla. Beat on medium speed until light and fluffy.

Slowly add flour, baking soda and 1/4 teaspoon salt. Continue mixing until well combined.

Meanwhile, toss popped popcorn with butter and 1/4 teaspoon Kosher salt.

Gently fold prepared popcorn into the cookie dough, until well incorporated. Spoon teaspoons of dough onto a parchment lined cookie sheet, 1 inch apart.

Bake for 14-16 minutes or until edges are slightly crispy.

Remove from oven and allow cookies to sit on the cookie sheet for 2 minutes prior to moving to finish cooling on a wire rack.