Preheat the oven to 350℉. Grease an 8x8-inch pan, or line with parchment paper. Set aside.
To a large bowl, add the flour, salt, and baking powder. Whisk well to combine.
In a separate bowl, whisk together the sugar and melted butter. Add in the eggs and vanilla, then whisk well again to combine.
Add the wet ingredient to the bowl of dry ingredients. Stir to combine, but avoid over mixing. There should be a few streaks of flour visible.
Add the chocolate chips and stir gently to combine.
Pour blondie mixture into the prepared pan and use an offset spatula or back of a large spoon to spread it into an even layer.
Bake in preheated oven for 35-45 minutes, until the edges are a deep golden brown.
Remove from the oven and let the bars completely cool in the pan for about an hour before attempting to cut.
Notes
For easier removal, grease the pan and also line it with parchment paper.
Don’t cut before they're cool. If you try to cut the blondie bars before they’re cool, you’ll end up with a gooey mess.
Store in an airtight container in a cool, dry place for up to a week. To freeze, let the bars cool, then keep in a freezer-safe container for up to 2 months.
To reheat from frozen: Let them come to room temperature, then microwave on High power in 10 second increments until treats are warm.