Line an 8×8 pan with parchment, this will make the blondies easy to remove and to cut cleanly. If you don’t use parchment, lightly grease the pan.
Measure out your flour, baking powder and salt in a small bowl. Whisk to combine.
Cream the butter and sugar until fluffy. Then add the eggs, one at a time, the vanilla, and vanilla bean seeds, and mix well.
Add the flour mixture and mix until just combined.
Fold in the nuts and white chocolate.
Spread evenly in your pan and bake for 35 minutes— a toothpick inserted near the center should come out moist with a few crumbs and the blondies will be light golden.