Step 1

Heat oven to 350°F.

Step 2

Beat egg whites and cream of tartar in large bowl with mixer on high speed until soft peaks form. Beat in coffee. Gradually add sugar, beating constantly until stiff peaks form.

Step 3

Add cocoa powder; mix well. Fold in chopped chocolate.

Step 4

Drop half the egg white mixture evenly into 9 mounds on each of 2 parchment-covered baking sheets, using about 1/4 cup egg white mixture for each mound.

Step 5

Bake, 1 baking sheet at a time, 18 to 20 min. or until tops are firm. Cool completely before removing cookies from baking sheet.