In a small bowl combine the flour, baking soda and salt; set aside
In a mixing bowl with paddle attachment cream together the butter and brown sugar until smooth and creamy
Add the egg, egg yolk and vanilla extract to the butter mixture and mix until fully combined (do not whip the batter and scrape down the sides in between mixing)
While the mixer is on low speed, slowly add the dry ingredients to the butter mixture and mix just until combined
Chop the semisweet chocolate chunks, milk chocolate chunks and chop or break the pretzel sticks and mix into the cookie dough batter
Chill the batter for 1 hour or if you have the time you can chill overnight
Preheat oven to 350 degrees F and line two baking sheets with parchment paper
Scoop the cookie dough into 4 oz cookie dough balls, sprinkle the top with course sea salt and place on a baking sheet leaving 3 inches in between each cookie
Bake the cookies for 10-11 minutes, remove from the oven and allow the cookies to cool for 10-15 minutes, enjoy!