01 - Set the oven to 400°F (200°C) and allow it to come to temperature.
02 - Cut the cold butter into slices and place in a large mixing bowl. Beat with a stand mixer using the paddle attachment until the butter begins to smooth.
03 - Add brown sugar and granulated sugar to the bowl. Beat for 1 to 2 minutes until fully combined and creamy.
04 - Mix in the eggs and vanilla extract, blending until just combined. Scrape the bowl as needed.
05 - Add all-purpose flour, cornstarch, baking soda, baking powder, and salt. Mix on low speed until the wet and dry ingredients are thoroughly combined.
06 - Fold chocolate chips and chopped pretzels into the dough until evenly distributed.
07 - Cut each soft caramel in half if large or keep whole if the pieces are small.
08 - Scoop 2 heaping tablespoons of dough per cookie. Flatten each portion, place a caramel piece in the center, then wrap dough around the caramel to seal.
09 - Place up to 9 cookies per baking sheet lined with parchment paper or silicone liner, spacing evenly.
10 - Bake for 8 to 12 minutes until tops and bottoms are golden, typically about 10 minutes.
11 - Immediately sprinkle each cookie with coarse sea salt while still warm.
12 - Let cookies rest on the baking sheet for 5 minutes before transferring to a cooling rack to cool completely or enjoy warm.
13 - Store cooled cookies in an airtight container or ziplock bag for up to 4 days.