Dissolve instant coffee in a small amount of hot water or melted butter before mixing into the batter to intensify the coffee flavor and prevent grittiness.

Toast the salted butter over medium heat until it turns golden and smells nutty (about 5 minutes), then cool slightly before adding to create a richer, more complex butterscotch flavor.

Fold in butterscotch chips gently at the very end to prevent them from breaking apart and distributing unevenly, ensuring pockets of whole chips throughout each bite.

Remove blondies when a toothpick inserted in the center has just a few moist crumbs (not fully clean), as they continue cooking from residual heat and will set to the perfect chewy texture.

Pack your brown sugar firmly into the measuring cup and add it straight from the bag without sifting to maximize moisture content and ensure fudgy, tender blondies.