I'm personally not a fan of mass gainers. Here are some tips I use in undergrad.
1. Bake chicken it's so much easier and less labor intensive. Thighs > breast
2. Ground turkey in tortillas with hot sauce or ketchup if needed. Sounds ridiculous and is but it's easy to make and good mix of protein and carbs with low fat.
3. Greek yogurt "triple zero" I forget what brand.
4. Eggs are ridiculously cheap
5. Peanut butter and milk. You'd be surprised how many calories (and fat) you can consume in 3 minutes shoveling in peanut butter and whole milk.
3000 calories is very easy. My tips come not out of necessity for time because I'm in med school but out of the fact that I absolutely hate cooking and food prep.
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