Instructions

1. Whisk the flour, baking soda, and salt together in a medium bowl. Set aside.
   
2. In a large bowl using a hand mixer or a stand mixer fitted with a paddle attachment, beat the butter on medium-high speed until smooth, about 1 minute. Add the brown sugar and granulated sugar and beat on medium-high speed until creamed, about 2 minutes. Add the eggs and vanilla and beat on high speed until combined, about 1 minute. Scrape down the sides and up the bottom of the bowl and beat again as needed to combine.
   
3. Add the dry ingredients to the wet ingredients and mix on low until combined. Fold in the frosted flakes and chocolate chips. The dough will be thick and sticky. Cover and chill the dough for at least 45 minutes in the refrigerator. If chilling for longer than a few hours, allow to sit at room temperature for at least 30 minutes before rolling and baking because the dough will be quite hard.
   
4. Preheat oven to 350°F. Line baking sheets with parchment paper or silicone baking mats. Set aside.
   
5. Scoop cookie dough, about 3 Tablespoons of dough per cookie, and place 4 inches apart on the baking sheets. Bake for 13-14 minutes or until lightly browned on the sides. The centers will look very soft.
   
6. Remove from the oven and allow cookies to cool on the baking sheet for 5 minutes before transferring to a wire rack to cool completely.