In a large mixing bowl, combine crushed pretzels, melted unsalted butter, and brown sugar. Mix well until evenly distributed, creating a sticky texture.

Line an 8x8-inch baking dish with parchment paper. Firmly press the pretzel mixture into the bottom, ensuring an even layer. Refrigerate for about 30 minutes.

After chilling, drizzle salted caramel sauce over the pretzel base, spreading it evenly. Let sit at room temperature for about 10 minutes.

Once set, use a sharp knife to cut into desired sizes. Return to the refrigerator for another 15 minutes before serving.