How to make chocolate brownies?

Ingredients
225g of unsalted butter, cubed;
3 eggs
135g of plain flour
¼ tsp of salt
300g Prestat dark chocolate buttons
½ tsp vanilla extract
275g caster sugar

Instructions
Preheat oven to 160C/315F/gas mark 2-3. Then grease up a square backing tray roughly 9 inches squared.
Melt the butter and 2/3 (200g) of the Prestat buttons in a saucepan at a low temperature.
Now whisk the eggs, vanilla and sugar together. Once the chocolate mix has cooled a bit add it to the sugar mix.
Sift the flour into the mixture and fold it in; now pour the mix into the prepared tin and then level the mix. Now sprinkle the remaining buttons over the top.
Now cook for 20 minutes and then ensure you allow them a good bit of time to cool as the stored heat will continue to cook the brownies.
Now cut them into squares and you will have your very own home made Prestat brownies.