Easy chocolate fudge

Line base & sides of shallow 20cm square tin with baking paper. Put 25g butter, 275g castor sugar, 150ml evaporated milk, half tsp vanilla flavouring, pinch salt in pan & stir over a low heat til sugar dissolves. Bring to boil then simmer 6 minutes. Remove from heat & add 75g mini marsh mallows & 200g milk chocolate drops stirring til melted. Place in prepared tin & leave 2 hours, Cut into 20 squares.