For a meal that's both satisfying and affordable, try a simple pasta stir-fry. Prepare your favorite whole-grain pasta, then season with salt and pepper or herbs. This anything-goes dish serves as the perfect opportunity to use leftovers before they go bad, whether it's a package of snow peas you haven't found a use for yet or the remnants of a jar of sun-dried tomatoes. Mix in chicken or tuna for protein, or add chopped hot dogs to please the kids. Make extra and save the leftovers to freeze or serve for lunch the next day.