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Preheat the oven to 325F. Line a baking sheet with aluminum foil then spray it with non-stick cooking spray.
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Place the pretzels onto the baking sheet in a single layer until it’s completely covered.
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In a small pot, melt the butter and sugar over medium low heat. Bring it to a boil, then continue boiling for 3 minutes, stirring constantly.
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Pour the bubbly mixture evenly over the pretzels. The caramel mixture will even out when it bakes, so don’t worry if you missed some spots.
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Bake it at 325F for 8 to 10 minutes until the caramel is fully bubbling on the entire sheet.
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Remove the baking sheet from the oven then sprinkle the chocolate chips evenly over top. Return the baking sheet to the oven for another 1 to 2 minutes to soften the chocolate chips.
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Use a spatula to spread the melted chocolate evenly. Then place the baking sheet in the freezer for 30 minutes.
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Remove the pretzel bars from the baking sheet and peel off the aluminum foil. Break it apart or cut it into squares with a large knife.