using (var context = new MyContext())
            {
                var userSettings = new UserSettings();
                userSettings.WindowHeight = 100;
                userSettings.WindowWidth = 400;
                userSettings.WindowX = 20;
                userSettings.WindowY = 25;

            	var newObject= new MyClass();
                newObject.Settings = userSettings;

                context.Add(newObject);
                context.SaveChanges();
            }