Vanilla Fudge Sheet Cake

Ingredients

1.	Pre-heat oven to Gas Mark 4 / 180°C / 350°F
2.	Grease and line the bottom of a 15" x 10" (38cm x 26cm) baking sheet
3.	In a large bowl, sift together the flour and baking powder, then stir in the salt and sugar and set to one side
4.	In a small saucepan, put the butter and whipping cream and bring to the boil stirring occasionally
5.	Add to the flour and sugar mixture, then stir to fully combine
6.	Stir in the eggs, sour cream and the extract and mix well
7.	Pour into the sheet pan and spread evenly, then bake for 20-25 minutes and allow to cool in the pan
8.	To make the frosting, cream the butter until pale and fluffy
9.	Add the extract and milk and beat until thoroughly combined, then add the icing sugar one spoonfull at a time
10.	Continue beating until the frosting is pale and fluffy then spread over the cake
11.	Cut into squares and serve