Preheat oven to 350°F. Prepare a 9 x 13" baking pan by spraying with cooking spray and/or lightly but thoroughly flouring the bottom.
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2.
In a medium bowl, whisk flour, baking powder, and salt until thoroughly combined.
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3.
In a second medium bowl, combine sugar and butter until butter is completely incorporated into the sugar. The mixture will be crumbly, similar to wet sand.
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Tip
These freeze really well, so they're a great make-ahead recipe for keeping some cookies in the freezer, ready in a pinch. You can cut the bars and roll each in powdered sugar prior to freezing.
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