Salted Chocolate Pretzels

3 C thin pretzels, broken into pieces
2 sticks butter
1 C light brown sugar
2 C semisweet chocolate chips
1 T sea salt

Preheat oven to 375 degrees. Line a rimmed 10 x 15-inch baking sheet with parchment paper; set aside. Spread broken pretzels in pan. In a small saucepan over medium heat, combine butter and brown sugar and bring to a boil. Cook three minutes without stirring. Carefully pour over pretzels. (Mixture will be very hot.) Bake five minutes, then place pan on cooling rack and sprinkle chocolate chips evenly over top. When chocolate is melted, after about two minutes, spread evenly over toffee. Sprinkle with sea salt. Let cool two to three hours, or until hard. Break into pieces.