If you're taking the time to cook, use it wisely. Prepare a double portion of one main dish that you can use in two or three additional meals. You can make two of something that freezes well, such as lasagna. Have one for dinner and freeze the other uncooked: Cool it fully in the fridge, remove any condensation, seal it airtight and store it in the freezer. When you're ready to eat it, thaw overnight in the refrigerator at least 24 hours, then cook it fresh.