Pour the cold Whipping cream into a bowl and whip for about 3 minutes using an electric mix on high speed. Beat until it becomes stiff,In another bowl, whisk together the condensed milk,powdered milk and strawberry flavour,Mix properly the whipping cream,powdered milk and condensed milk-strawberry extract mix in a bowl,Pour into an airtight container, cover it and store in a freezer overnight or for some hours

 Note: Since you are using Sweetened Condensed milk, you don't need to add sugar, but if you are using fresh milk, then you should add some sugar and egg yolk)