In a bowl sieve cocoa powder, powdered sugar and maida. Mix the dry ingredients properly.

In a pan take milk and add the above mixture in batches. Stir properly to avoid lumps.

Cook it for 2 min by stirring continuously. Now add butter in the mixture to add shine in sauce. Again cook for 1- 2min

If mixture is thick add little milk and cook. Chocolate sauce is ready now. Cool it and store in airtight container.