Here it is - by popular demand - my post on Once-A-Month-Cooking (aka OAMC).

The Definition
Spend one day cooking enough meals to feed your family for a month. You cook double or triple of each recipe and put it in the freezer to be thawed and eaten later on.
For us, we dedicate one day every 5-6 weeks for OAMC. I usually create "the plan" during the week, go shopping Friday night and cook all day Saturday or Sunday. Doug watches the girls while I concentrate on cooking. We have a deep freeze, but you don't need one to do this. See this example here to prove it!
My Motivation
OAMC is really the single most money-saving thing that we do for our grocery budget. Yet, while I was initially attracted to OAMC for frugality, I've found it really saves my sanity as well.
With two small kids, it's hard to cook a homemade meal with little hands constantly pulling at my pants, and the incessant WHINING: "I'm HUN-gry, I want to help, I want Mommy to read a BOOK!" It's so much better to turn on the oven, pop in a pan and play with the girls until the timer dings. Ahhhhh...
My sister, Sharon, also loves OAMC. She and her husband Chaz both work full-time and don't have a lot of time to cook meals when they get home from work each day. OAMC is perfect for them.
Plus, OAMC is good for you, because you are cooking homemade meals and can control the type and quality of ingredients that you use.
"The Plan"
Ok. So how do we do this? First, I come up with a list of recipes that I want to make for the next month. I try to balance these out, so it's not ALL chicken or ALL beef or ALL Italian, etc. I have some tried-and-true recipes that we love (see
here on my recipe blog) and I love trying one or two new ones each time. I also take into consideration what's on sale at the grocery and what I have on-hand in the freezer.

I then come up with my shopping list. I use a computer program called,
MasterCook, which is great for OAMC. You can select your recipes, set how many of each you want to make (double, triple, etc.) and have it automatically create an ingredients list for you. It's not perfect, but does a decent job of combining ingredients and will even sort them by grocery store location. Faster than I could do, anyways! I print out this list and go through the house to cross-off items that I already have on hand.
Shopping
Pretty self-explanatory. I shop and purchase everything on my list. It never fails to amaze me how little I actually spend for a cart full of ingredients, knowing that it will feed our family for many weeks!
I shop without kids. This is CRUCIAL to saving money, as you can concentrate on finding the best deals (coupons/generic/manager's specials).
The Execution
Most OAMC'ers will tell you that they create a plan of attack, where they first cut all the veggies and then cook all the meat, etc. I pretty much just do one recipe at a time. If we've got 6 lbs of beef to cook, I'll probably cook that all at once and put it in the fridge, but I do the rest one at a time.

After each recipe has been cooked and cooled slightly, I package it up for the freezer. Whenever possible, I like to put the food in a gallon-sized freezer Ziplock bag. (FYI - the generic brand hasn't cut the mustard for me, so I buy Ziplocks in bulk from Sam's Club.) Otherwise, I make casseroles and lasagnas in foil dishes that I wrap in aluminum foil and freeze.

I label each container with the recipe name, date and instructions for cooking. I often quickly print off the "after frozen" instructions from the computer and tape it directly to the container. It's easier to do this than to look up the recipe each time you pull out a meal. Plus, if you decide to give one away to somebody else, it will be clear what to do with it. (Make sure you say whether to thaw or not to thaw.)
If the recipe calls for cheese or some fresh herbs to be sprinkled on after baking, I will store these in smaller freezer bags (or vacuum bags) alongside the meal. Just make sure to label these so they won't get used for something else. For example, a little bag of mozzarella cheese should be labeled, "Jumbo Shells."

For soups and soup-like recipes, I have a special way of getting it into my bags. I first label the freezer bag with a Sharpie, and then put it into a plastic drink pitcher. Then I ladle the soup carefully into the bag, so it doesn't splash over the sealing strips (I'm picky) and cool the whole thing in the fridge. Then just pull it out, seal and store.
Sometimes I use a straw to suck the excess air out of the bags, a cheap vacuum effect.
For Beginners
If you enjoy cooking and think you'd like to give this a try - do it! Maybe start off with 2 or 3 recipes and double each one for a start. I usually only make a single recipe of each new recipe to make sure we like it, anyways.
Resources
Here are a lot of resources that I use to find recipes, and learn more about how others do OAMC:
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Recipezaar OAMC Recipes*
NyeSista's Recipes (my family's recipe sharing blog)
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Fix-It and Forget-It Cookbook*
Dream Dinners Cookbook*
Once-A-Month-Cooking - the original handbook for OAMC, written by my friend's aunt!
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Beth's OAMC Page*
Recipezaar OAMC Plan Forum*
Robbyn's Friendly Freezer*
Deb's OAMC Keeper Recipes