Preheat oven to 350F and line 2 baking sheet with parchment paper.
In a medium bowl, sift together the flour, baking powder, baking soda, and 1/2 tsp of the salt. Stir and set aside.
In a bowl of a standing mixer, fitted with the paddle attachment, place the butter and sugar and beat medium-high until light and fluffy. About 5 minutes.
Add the egg and vanilla into the butter and sugar mix.
Sprinkle in the flour mixture followed by the caramel popcorn and mix on low just until the popcorn is fully incorporated.
Using a cookie scooper, scoop the batter and place on the lined baking sheets leaving about 2" space for the cookies to spread.
Sprinkle the remaining of the salt on the cookies and bake for 12-15 minutes. Rotating the pan midway through the baking time.
Remove from the oven and let cool.