yeah thats not much food at all my man, even lots of junk food is not THAT high in calories like pop tarts and bistro stuff pizza pockets etc.
like many have said before
2 scoop whey
3 tbsp peanut butter
2 cups 2% or whatever % milk
1 cup oatmeal
thats over 1100 calories right there and is fast to make and tastes good.
what i used to do is eat my meal then chase it with one of those or a weight gainer.
I do rely on weight gainers a lot while i gain but im not going to mention brands on this site.
look at the ingredients ie. carb sources protein sources, make sure its reasonably low sugar. i like ones with at least 50g protein and 100g carb per serving but ones with 60g protein and 150g carb are great too.
the problem isnt that your eating that type of food but KEEP TRACK of how many calories and grams of protein you are injesting at least for a while so you have a good idea when youve ate your calorie goal for the day.
pic a number go from there and religiously hit it every single day and whatever you dont eat one day make up for it the next
its a pain in the ass at first but then it becomes second nature ive done it for years