I guess the best advice is to see what you can eat Lage amounts of with out upsetting our stomach!
Any Kombination of fat with carbs is good ( pizza, ice cream, chocolate, chips are the obvious ones but like dipping your bread in olive oil, nut butters)
Consistency is Key, stuffing one day a week is nice but if you don’t get your calories in everyday it can become difficult so stuffing are a bonus not a real tool except you get stuffed everyday witch can be hard on the digestive system…
Snacking is what really get the pounds moving in 🐷
Dinking your calories is also oblivious choise
So if you have not time to snack because of work or what ever.
You can have shakes there are a lot of recepies with cream, with weight gainer, self made more raw yous see what you like and can get your hands on ( be careful with stuff like boost they can contain high amounts of Electrolites vitamins that can cause problems when you drink to much and to often)
Easy shake 400ml of full milk a banana 100 ml of cream 200 gram of serous mass and a spoon of almond butter
-and you have a solid 1500 calories, adding this to a solid meal on days where you can’t eat a lot and you can be quite sure you don’t lose any weight or to pump you daylie in take !
Eating 3000 calories is quite easy I would say if you spread them out through the day adding this on top with cranking it a little will have you coming in at ~5000 calories dayly !
And I mean like if you start eating like that you can now order a new set of clothes now because you will put grow them in no time 🐷
Also look in to digestive enzymes ✌🏻