Heat oven to 350°F. Bake and cool cookies as directed on package.
In 1-quart saucepan, cook brown sugar, butter and milk over medium heat 2 minutes, stirring occasionally, until butter is melted and mixture is smooth. Remove from heat; stir in malted milk powder and cocoa. Spread glaze on tops of cookies; sprinkle with malted milk eggs. Store covered in single layer.