I don't do Once-A-Month cooking as I can't stand around in the kitchen that long at a time...never mind the dishes wouldn't get done afterwards without a maid!
However, I do a lot of things that cut down on prep time later. In the end many/most meals end up taking very little time to put together...sort of like using Chicken Helper, but better.
I buy boneless chicken breasts in bulk, toss them in the crockpot on low all day, cool down & shred. Then I repackage into meal-sized portions. There's always enough broth in the crock to freeze for a good batch of tortilla soup later.
I buy family packs of ground beef & brown it all at once, put in a colander to drain off any fat (although I usually get 90% lean) & then put in meal-sized bags and freeze.
When I make a ham, we'll eat left-oevers for a couple days & then I run the rest through a chopper. I freeze that as well - to add to eggs & a few other recipes and to make ham salad for lunches.
I make turkey often during the winter, but I don't do the whole stuffed thing. I use a good rub, cook it until it's falling off the bones & then shred that. I cook the bones to make broth & serve it like beef au jus on rolls. I also freeze it both in the broth & dry to use in other recipes.
I find that this cuts down so much on the prep that when I
do make a recipe with raw meat I don't mind...because it isn't a daily occurrence, you know?
Oh - and I also freeze chicken to do on the grill (or in the oven) already marinated. That way when it defrosts it marinates. You just freeze them in a gallon Ziplock baggie...those recipes usually have "DUMP" in the title.
Now I don't do all this at the same time. I usually do one thing per week - the day after shopping day. It never seems overwhelming (like OAM does) but I get the same basic benefits.