Creating Crispy Pretzel Bars is simple and fun. Just follow these straightforward steps:

1. Preheat your oven to 350°F (175°C). Prepare a baking dish by lightly greasing it or lining it with parchment paper.
2. In a mixing bowl, combine the crushed pretzels and a pinch of salt. Set aside.
3. In a saucepan, combine the granulated sugar, light corn syrup, and unsalted butter. Cook over medium heat until the mixture comes to a boil, stirring constantly.
4. Once boiling, reduce the heat and let it simmer for 2 minutes without stirring.
5. Remove the saucepan from the heat and mix in the vanilla extract.
6. Pour the hot syrup mixture over the crushed pretzels. Stir quickly until all pretzels are evenly coated.
7. Spread the mixture evenly into the prepared baking dish, pressing down firmly to create an even layer.
8. In another saucepan, melt the chocolate chips over low heat, stirring constantly until smooth.
9. Once melted, pour the chocolate over the pretzel mixture, spreading it out evenly.
10. If desired, sprinkle mini marshmallows on top of the melted chocolate and gently press them in.
11. Allow the bars to cool at room temperature for about 15 minutes. Then, place them in the refrigerator for another 30 minutes to set.
12. Once firm, cut into squares or bars and serve.

These steps will guide you to create your own irresistible Crispy Pretzel Bars without a hitch!