1. Preheat your oven to 350°F (175°C). Line a 9×13-inch baking pan with parchment paper, leaving some overhang for easy removal.
2. In a medium bowl, whisk together the flour, baking soda, and salt. This dry mix will give your bars the perfect structure.
3. In a large bowl, combine the melted butter with both the brown sugar and granulated sugar. Stir until the mixture is smooth and glossy. From years of baking with my grandma, I learned that fully melting the butter but letting it cool slightly ensures the sugars dissolve well for a tender bite.
4. Beat in the eggs one at a time, followed by the vanilla extract. The batter should look creamy and well combined.
5. Gradually add the dry ingredients to the wet, mixing just until incorporated. Overmixing can lead to tough bars, so keep it gentle.
6. Fold in the butterscotch chips and crushed pretzels, saving a handful of pretzels to sprinkle on top for that extra crunch.
7. Pour the batter into your prepared pan and smooth it out with a spatula. Sprinkle the reserved pretzels evenly over the top.
8. Bake for 25-28 minutes or until the edges are golden and a toothpick inserted near the center comes out with a few moist crumbs. I always keep a close eye after 20 minutes because ovens vary—nothing beats that perfect chewy center!
9. Remove from oven and allow the bars to cool completely in the pan before lifting out with the parchment paper. Cut into 16 squares and get ready to enjoy.

One tip I’ve picked up from years of cooking for my family: letting the bars cool fully makes cutting cleaner bars and helps the flavors meld together beautifully. It’s worth the wait!