Try www.supercook.com. It's great for adding all the ingredients in your pantry and it lists recipes that you can make with what's on hand.
Another trick to stretch the dollars and utilize leftovers is to plan ahead. I like to roast a chicken with some veggies. We eat that as a meal. The next day, I take the leftovers and pick all the meat of the chicken and then toss the carcass and leftover veggies, some extra onions, herbs, etc into a large pot with enough water to cover the carcass. Bring to a boil and simmer for a few hours. I now have a wonderful homemade broth that is healthier and cheaper than store bought. With the leftover meat and broth, I have the foundation for a stew, soup, enchiladas, etc, etc. I use what I have on hand or I freeze my stock for another time. The meat can be frozen for the end of the month and tossed into a salad, rice or pasta with some veggies for a quick and easy meal.
Another "double meal" is to take a pork loin and cook it with any form of homemade glaze. Serve with cheap veggies like roasted potatoes and carrots, etc. The leftover pork makes a great sandwhich meat for lunch or dinner. or you can serve it thinly sliced in some noodles with a little soy sauce, honey, water, garlic, etc to make an asian style meal. Toss in some lightly steam veggies and it's a complete meal completely different from the previous night and no wasted leftovers. Helps stretch the dollars to plan leftovers and avoid waste. This time of year is great for dollar stretching too. You can pick a ton of fruit for cheap, wash cut and freeze it for fresh healthy fruit to be eaten in cereal, yogurt, as a dessert, frozen in ice as a treat for kids, pureed in milk for a "smoothie" and so on. The fruit is fresh and healthy, far cheaper than purchased at the store and handy all the time! It is also cheaper than junk food and more nutritious when done this way to keep the kids stocked with snacks and treats.
Things like butter can be purchased in bulk and frozen as well as bread. This cuts down on trips to the store for perishables. We all know what it's like to go to the store for one or two things and to walk out with a cart full of stuff we suddenly "needed." By avoiding those extra trips, we save a ton of money!