Preheat the oven to 175ºC. Line a baking sheet with parchment paper.
In a large bowl, whisk together the flour, baking powder, and salt. Set it aside.
In another large bowl, using an electric hand mixer or stand mixer, cream together the butter, brown sugar, and granulated sugar.
Add the egg and vanilla extract. Mix well. Add the dry ingredients into the butter mixture and mix until the dough forms.
Fold in the pretzels, chocolate chunks and chocolate chips
Using 1 spoon or ice cream scoop, place the dough onto the baking sheet.
Bake the cookies until they are lightly golden, about 16 to 18 minutes.
Remove the cookies from the oven and top them with some flaked sea salt.
Allow the cookies to cool slightly before enjoying.