Preheat your oven to 350°F (175°C) and line an 8x8-inch baking dish with parchment paper.

In a medium saucepan, combine ½ cup of unsalted butter and 1 cup of packed brown sugar over medium heat. Stir until melted and bubbling, about 3-5 minutes.

Remove from heat and fold in 4 cups of pretzels until evenly coated.

Transfer the mixture to the baking dish and press down firmly to create an even layer.

Bake for about 10-15 minutes, until edges are golden brown and the center is set.

Remove from oven and sprinkle 1 cup of chocolate chips over the top; let sit for 5 minutes to soften.

Spread the chocolate evenly across the surface once softened. Allow to cool until set, around 1 hour.

For best slicing, refrigerate for an additional 30 minutes before cutting.