First of all pre-heat the oven to 350ºF {180ºC}

In a glass bowl, put the butter and the chocolate chips and take it to microwave for 2-3 minutes {depending your microwave potency}.

About half time stir and put it back. It should be ready when it’s completely melted and smooth. If you don’t have a microwave you can always go for “bain-marie” {hot water bath}.

Then stir the sugar, salt, and vanilla and mix well.

The eggs should be added one at a time mixing well until they are completely mixed.

Then add the flour and baking soda and stir strongly with a preferably a wooden spoon. It gets very hard so you have to put a lot into it.

Mix until the batter is smooth and shiny.

Let it cool and for the last add the mars chunks and mix.

In a baking tray, spray some butter and place about a spoon per cooky. Make sure to leave space so when they grow, they don’t stick together.

Bake for about 10 minutes or until you see them cracked and puffed up. Take them out so they still are soft and gooey. They will get thinner and a bit harder when they cool but still soft inside and with melted caramel from the chocolate bars.