To increase calories with more nutritionally dense food, you can mass cook the following affordable items and put it away in containers for the week:
- Ground beef (brown several pounds, add garlic,salt,onion)
- Avocado or guacamole chunks
- LIVER (lots of garlic and salt, you can mash it to make a pate, even)
- Pasta
- Chicken thighs, like previous poster said
- canned mackerel or other similar fish, mix with mayo, put it on wheat toast
-poached eggs from the microwave takes about 90 seconds, no excuse to skip breakfast. They slide around easy so you can even put them in ziploc bags and eat in the car ride on your way to work. They dont stink like boiled eggs do either.
Your highest (healthy) calories will be in animal fat, followed by oils and nuts. Don't eat a bunch of fried food to gain mass.