Stir brown sugar and melted butter together. Add egg and vanilla. Mix well.
Stir in salt, baking powder, and baking /soda. Gradually add flour a little at a time. Stir until just combined.
Fold in white chocolate chips and chopped walnuts.
Evenly spread batter into a greased 9x9 inch pan lined with foil.
Bake 20-25 minutes or until a toothpick inserted in the center comes out with just crumbs.
For the Maple Butter Sauce
In a medium saucepan, melt butter over medium heat. Stir in maple syrup and brown sugar. Stir constantly until sugar is dissolved. Fold in walnuts.
Serve blondies topped with maple butter sauce and a scoop of vanilla ice cream if desired.
Notes
Ingredient Notes and Shopping Tips
Flour: Measure your flour by spooning it into your measuring cup and then leveling it off with a knife. Do not scoop your flour into the measuring cup, as you'll likely use too much.
Brown Sugar: Both light and brown sugar work fine. When you measure it, pack it down in the cup.
Maple Syrup: Use pure maple syrup if possible. It has a richer flavor and no corn syrup!
Krystle's Tips
Line Your Pan: Line your pan with nonstick foil or parchment paper for easy cleanup.
Use Room Temperature Ingredients to help everything combine smoothly.
Don't Overmix: Mix until the flour just disappears. Overmixing will lead to a tough, dense blondie.
Don't Overbake: Blondies are done when a toothpick inserted a few inches from the center comes out clean. It's okay if the middle is still a little underbaked; they will firm up as they cool.
Knife Hack: Cut with a plastic knife instead of a metal one because they're naturally nonstick.