Preheat oven to 350 degrees

Line a baking sheet with parchment paper and spread the 3 cups of whole pretzels over to cover the pan evenly

Add butter and brown sugar to a sauce pan and bring to a boil

Boil 2 - 3 minutes, stirring constantly, until thick

Pour over pretzels and us a rubber spatula to spread it out

Place pan in oven and bake at 350 degrees for 4 - 5 minutes, until edges are bubbly

Remove from oven and immediately sprinkle on the whole bag of chocolate chips on top

Allow chocolate chips to sit for 5 minutes and melt, then use a rubber spoon or spatula to spread the chocolate out to cover the pretzels

Sprinkle the crushed pretzels on top of the melted chocolate

Place pan in fridge or freezer until set, around an hour or two.

Once hardened, use your hands to break the bars into pieces

Store leftovers in an airtight bag in the freezer until ready to eat