Need to gain weight

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Looking for buddies in the same boat. Try as I might, I find it extremely difficult to gain weight even after upping my cal & protein intake. To tell the truth, I'm getting tiered of cooking and eating so much daily...it's become a chore. I'm 6' and the most I've ever weighed was 155, I'm at 147 and having trouble gaining with a 3000 cal & 150g protein daily diet. Any advice is welcome. Thanks all