1. Combine melted butter, pretzels, and powdered sugar. Press into bottom of greased 9x13-inch sheet pan.
2. Place chocolate chips and peanut butter in a mixing bowl and smoke in smoker at 250 degrees until melted, approximately 10 minutes. Alternately, you can melt chocolate in a microwave, or over a double-boiler, and then combine with peanut butter.
3. Once melted, stir together until smooth and spread over cooled crust. Top with smoked salt and chill until firm. Cut into squares.