Preheat oven to 325 degrees F. Line two baking sheets with silicone mats.
In a small mixing bowl, mix together flour, baking soda, and salt.
In a large mixing bowl, mix together brown sugar, white sugar, and melted butter with an electric mixer on medium speed for a few minutes until well combined and fluffy looking. Mix in egg and vanilla.
Mix in flour mixture. Then stir in semi-sweet chocolate, milk chocolate, pretzels, and caramel.
Divide dough into 4 (about a ½ cup of batter each), and place 2 on each prepared pan. Flatten dough into large circles.
Bake cookies about 16-20 minutes or until lightly golden brown around edges, rotating pans halfway through.
Cool slightly then remove from pan and place on wire racks to cool completely.
