help me gain weight OOT

[poker1O1]

I'm 6'1", ~150 lbs, 22 yrs old. I see a lot of people successfully lose weight on here, and I want some advice on doing the opposite. I'd like to gain ~25 lbs in 4 months. I dont wanna eat Big macs everyday though. I eat pretty healthy, work out regularly, and cant seem to gain a pound. I've tried whey, creotine...all that [censored]. Do I need to eat a ton of carbs? Anything besides pasta? I'm open to ideas.