If your looking for healthy Kcal dense foods ill give you a list, I had to learn about these cause I cant get away with eating em.
Protein: Beef of any kind, Lamb Liver, Whole Chicken i.e Dark meat, Whole Eggs, Full Milk, Pork, Salmon, Ham, Brisket, Meat Balls.
Fats: Olive oil, Nuts of any kind, Coconut oil, Coconut meat, avocado, natural PB, Fish oil, Flax oil.
Carbs: Potatos, Wild Rice, Brown Rice, Whole Grain pasta, Whole grain bread/wraps, Yams, Oatmeal, Fruits, Vegetables.
Heres a really simple recipe that you can use at collage that have loads of good Kcals and loads of healthy fats/carbs plus a good dose of protein:)
1) Easy protein bars.
1 cup oatmeal
6 scoops whey
1/2 cup almonds/cashews/ hazelnuts etc
1/2 cup natural PB
Step one: Add all ingredients into a bowel.
Step two: Mix until the whole thing turns into a paste like material(if its too hard just add more PB)
Step 3: Make into little hot dog shaped bars.
Step 4: Put in fridge for 3 hours and your done
*If you want to have even more protein in it just add 1/2 cottage cheese or just add more whey, realistically you can play around with this recipe as much as you need until it fits your goals.
It doesn't get any simpler than this tbh and its customizable to the end:)