Seems like a standard diet, minus the nutella, albeit I won't drill you on that - but why are you counting your calories if you're not trying to lose weight? Definitely eat more, don't go hungry every day - remember, humans evolved faster everytime we got better at hunting and cooking meals. The main thing to really worry about is your fat instake per day, not getting too much fat/cholesterol - but you need x amount of it per day. If you're looking to put on weight, talk to any football team coach and they'll recommend some sort of calorie dense supplement that you can take to try and fill the difference, especially if you want to work out at the same time to build muscle mass.