Place a layer of pretzels on top of the parchment. Try to fit as many pretzels as possible in a single layer. It's okay to use a few broken pieces too.
4 cups small pretzel twists
In a saucepan over medium-low heat, melt the butter. Then stir in the brown sugar.
1 cup butter, 1 cup brown sugar
Bring to a boil, stirring often. Once it begins boiling, turn the heat to low and boil for 3 minutes.
Immediately remove caramel from heat and pour over pretzels. Try to pour all over the pan, but it will not fully cover the pretzels.
Place in a preheated 375° oven for 7-8 minutes until the caramel is bubbly all over. The caramel will have spread and will now cover the entire pan.
Remove from the oven and sprinkle with chocolate chips. Return to oven for 2 minutes.
2 cups chocolate chips
As soon as you remove from the oven, spread the chocolate chips with an offset spatula.
Add spinkles and salt.
½ cups sprinkles, ½-1 teaspoon flake salt
Allow bark to fully cool, then break into pieces. Store in an airtight container at room temperature.
Notes
The butter and brown sugar will appear separated until it begins to boil.
Stir the butter and brown sugar often to help prevent scorching it.
Pour the caramel over the pretzels while it's still bubbling. Use caution, the caramel is very hot and will burn.
Don't spread the caramel. It will naturally spread while it's in the oven.
Allow the bark to fully cool before breaking it into pieces.