Preheat the oven to 350 F. Line a 12 cup muffin pan with paper liners. In a medium bowl, whisk together flour, salt, and baking soda. In another large bowl, combine butter, and both sugars. Mix until fluffy.
Add in egg and vanilla extract, mix until smooth. Add in the flour mixture and mix until it is fully combined. Fold in the chocolate chips and crushed pretzels.
Evenly divide the cookie dough the prepared muffin pan. Place one unwrapped Rolo into each dough, covering it fully. Bake for 15-20 minutes.