Cream the butter and sugars. Once creamed, combine in the egg and vanilla.
Sift in the flour and salt, then the chocolate chips.
Roll into walnut size balls, for a more homemade look, or roll into a long, thick sausage shape and slice to make neater looking cookies.
Place on baking paper. If you want to have the real Millie's experience then bake for just 7 minutes, till the cookies are just setting - the cookies will be really doughy and delicious. Otherwise cook for 10 minutes until just golden round the edges.