There is one main reason we make out a weekly menu: to avoid unnecessary trips to the grocery store. I have found that when we are unprepared we almost always choose meals that involve a trip. Paying attention to what's in your pantry and freezer and basing your weekly meals around what's on hand can be a real money saver.
Having a large and varied batch of recipes is also a big help; twenty chicken recipes will stand a better chance of including one that has what you have on hand than only five recipes, so it's good to branch out with plenty of options. To that end I decided to gather all of my recipe posts in one place, namely this post. I hope you find something here you can use!
Friendship Soup Mix
Pat’s Corn Chowder
Mom’s Mac and Cheese
Chipped Beef over Chow Mein
Tuna and Noodle Casserole
Don’t Eat Out, Find a New Recipe