Preheat oven to 350 degrees.
In a large bowl, cream butter, brown sugar, and granulated sugar together with a mixer until well combined.
Beat in the egg and vanilla.
In a medium bowl mix the flour, salt, and baking soda.
Add to wet ingredients until thoroughly combined.
Gently stir in the white chocolate, butterscotch chips, and pretzels.
With a tablespoon sized cookie scoop, form balls with the dough.
Place onto parchment lined baking sheets 2" apart.
Press down on the dough rounds slightly and sprinkle with sea salt.
Bake cookies for approximately 12-15 minutes or until golden brown. DO NOT OVER BAKE.(they will become hard)
Let cool for 3 minutes before transferring to cooling rack.