Instructions: With a mixer on high speed, beat butter and granulates sugar until fluffy.

Add egg whites and beat until well-blended. Stir in flour, cocoa, and baking powder; mix until well blended.

On a buttered 12 x 15" baking sheet, shape dough down the length of the pan
into a flat log 2 1/2" wide and 5/8" thick.

Bake in a 350 deg F oven until crusty and firm to touch, about 20 min.

Let
cool about 5 min.

On pan, cut log diagonally into 1/2" thick slices. Lay slices cut side down

(they can touch). Return to oven and bake until cookies feel firm and dry,
15 - 20 min. Transfer to racks; let cool.

Smoothly mix powdered sugar and enough milk to make pourable icing.

Using
a spoon, drizzle icing decoratively over biscotti. Let stand until icing is
dry, about 15 min. Serve, or store airtight up to 1 week.

Makes about 20

NOTES :

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