Mix the eggs with nice mixer, then add the melted butter (I melted for 4-5 seconds in the microwave) and sugar, which also beat with mixer. Then add the flour, in which we have added raising agent (I used baking soda) and salt and mix well with a spoon until a smooth mixture. The mixture should be thick and optional to it we can add something, such as nuts, raisins, chocolate or whatever you want. Once the mixture is ready to pour into a container with baking paper. Bake 50-60 minutes (at least) 180 ° C (not higher degrees).