These are always a winner, even amongst Americans who, let's face it, are so much better than us (N.B.- this is a 'European inclusive us' not a 'British nationalistic us') at chocolate chip cookies. The original recipe is from Mary Berry for cookies three ways, but the chocolate ones are by far the most popular 'chez nous' - and we have altered the recipe a tiny bit to make them less sweet over time.
175 soft butter
175 plain flour
55 g of sugar (the original recipe calls for more, but they come out too sweet for my taste)
70 g dark chocolate chips (or less if you follow the original recipe and do not like the bitter taste of dark chocolate)
Preheat the oven at 180 degrees, Mix all the ingredients but the chocolate in a food processor (pulse it). Then mix the chocolate chips by hand. Make little balls with the dough, put them on a lined baking tray, press them down with your fingers to flatten them and bake for 12 minutes.
If you want softer cookies replace the semolina with plain flour and add a teaspoon of corn starch.