Mix the first 4 ingredients with the wire whisk and then add the rest, always mixing well. Pour the mixture into a buttered baking pan and bake in a preheated oven for 35-45 minutes. Check if it is well baked by dipping the blade of a knife into the pie. If it comes out clean, then our dessert is ready, otherwise leave it a little longer. After it has cooled, serve and if desired, sprinkle with a little icing sugar for a more beautiful result.