Chocolate Cinnamon Doughnuts

• 3 tbls unsweetened cocoa powder
• 2 tbls butter softened
• 1 1/2 tbls boiling
• 1 egg (beaten)
• 1 tbl unsweetened cocoa powder
• 1/2 tbl butter softened
• 250 gr flour
• 200 gr powdered sugar sifted
• 130 gr sugar
• 80 ml buttermilk