Cool the Brownies Completely:
Make sure your brownies are fully cooled before adding powdered sugar. If the brownies are warm, the sugar may melt and lose its dusted appearance.

Prepare the Powdered Sugar:
Sift the powdered sugar using a fine-mesh sieve to remove any lumps. This will ensure an even and smooth coating.

Dust the Brownies:
Use the sieve or a small sifter to sprinkle the powdered sugar over the brownies. Hold it a few inches above the surface and gently tap or shake to create a light, even layer.

Slice and Serve:
For clean cuts, slice the brownies before dusting with powdered sugar, or carefully re-dust any areas where the sugar might get disturbed.