Planning & Prep

Leftover Recipe Generator: How To Use Leftover Food



Last Updated: Apr 3, 2023

According to the USDA, over one-third of all available food in the United States goes uneaten due to loss or waste. Food waste can negatively impact the environment due to a rise in methane emissions from food rotting in landfills. Additionally, when you waste food, you are also wasting labor, energy, water and even land.

Thankfully, there are ways to cut down on food waste — when you’re not sure what to do with your half-used avocado, frozen corn or cooked chicken breast, you can turn your scraps into a whole new meal.

To use our free leftover recipe generator, type in up to three ingredients. Based on the ingredients you choose, our library of 1,000+ recipes will calculate what you can make.

Leftover recipe generator

List up to 3 ingredients to discover recipes from your leftovers.

No ingredients entered

Recipes you can make with these ingredients:

Instacart Logo

What can I make with the leftovers in my fridge?

When it comes to repurposing the leftovers in your fridge, you need to think strategically.

For example, if you have frozen pizza and a fridge full of veggies about to expire, you can create your own vegetable pizza pie. Start by cooking your pizza based on the directions on the box. While the pie is cooking, wash and finely chop your vegetables, then place them on the pizza halfway through the cooking time.

When in doubt, you can utilize a leftover recipe generator to calculate what to make with the ingredients that are about to go bad.

What leftovers taste better the next day?

Did you know that casseroles, pizza and even soup are leftovers that taste better the next day? Most pasta dishes, like lasagna and bolognese, warm up nicely on the second day — which is perfect if you’re looking for meal prep ideas. Stews and chili are also good options if you are unsure of what leftovers taste better the next day.

Instacart Blog Banner (Horizontal)

How long do leftovers last?

According to the USDA, leftovers are safe in the refrigerator for three to four days or in the freezer for up to four months — however, it is common for frozen leftovers to lose flavor and moisture when stored for long periods.

A key indicator that it’s time to throw out your leftovers or unused ingredients is when there is a foul odor or discoloration. 

How to safely reheat leftovers

When it comes to safely reheating leftovers, you want to make sure the food reaches a safe internal temperature of 165°F and is refrigerated or frozen properly. According to the USDA, food left out and not properly stored or cooked to a safe temperature can cause foodborne illness.

Reheat soups, sauces and gravies by simmering them slightly to a consistent boil. For solid leftovers that require an oven for reheating, be sure to cover them with foil or a lid so that it retains moisture and heats evenly. You can use a microwave to safely reheat leftovers, but beware of cold spots — use your food thermometer to check that the internal temperature reaches 165°F.

Leftover cooking tips and tricks

person using their leftover food for a new meal

Still unsure what to do with extra scraps of food? Here are a few tips and tricks for leftover cooking.

  1. Keep all scraps: The first step to cooking leftovers is to not throw away your food (unless it’s expired meat) — you can also learn how to compost your leftovers to help reduce methane emissions in landfills.
  2. Cook more portions: Prepare double the amount of food so you can freeze the rest for later.
  3. Store properly: Invest in food storage containers to safely store your leftover food.
  4. Plan out your meals: Schedule a dedicated day where you eat only leftover food to eliminate waste.
  5. Change your mindset: Look at leftovers as ingredients you can turn into new recipes vs. repeating the same meal.
  6. Stock up on the essentials: Make sure you have basic spices and condiments on hand like mayonnaise, ketchup, garlic powder, nuts, grains and vegetables.
  7. Label your leftovers: Write the name and date on your leftovers for easy identification.
leftover food tracker mockup
button to download the leftover food tracker

Leftover thoughts

When it comes to cooking, it’s important not to throw away your leftover ingredients. You’ll see by using our leftover recipe generator that you can create an entirely new recipe with your leftover carrots, garlic cloves and lemon chicken breast. Or reinvent your frozen chicken noodle soup by turning the vegetables and broth into a sauce for salmon.

If you’re in need of extra ingredients for your recipes, you can lean on Instacart’s online ordering system. Receive your missing ingredient quickly and right to your door with speedy delivery service. Get started with your grocery shopping right now!



Instacart is the leading grocery technology company in North America, partnering with more than 1,400 national, regional, and local retail banners to deliver from more than 80,000 stores across more than 14,000 cities in North America. To read more Instacart posts, you can browse the company blog or search by keyword using the search bar at the top of the page.

Most Recent in Planning & Prep

64 Best Salad Toppings for a Delicious Meal

Planning & Prep

64 Best Salad Toppings for a Delicious Meal

Tired of eating the same old salad? It's time to mix up your salad toppings for some textural and flavor variety! Toppings like tortilla strips, croutons and nuts offer a pleasant crunch, while creamy, salty…...

Dec 2, 2023
How To Eat Cottage Cheese: 15 Easy Cottage Cheese Recipes


How To Eat Cottage Cheese: 15 Easy Cottage Cheese Recipes

Cottage cheese is having a moment — and for good reason. It's one of those versatile and nutritious foods that can transform any recipe into a velvety smooth treat. This dairy product is made from…...

Nov 22, 2023
41 Gluten-Free Dinner Ideas Full of Flavor


41 Gluten-Free Dinner Ideas Full of Flavor

Gluten, the protein found in wheat, barley and rye, is a popular ingredient in a lot of dishes. However, some folks are sensitive and even allergic to gluten. Thankfully, there are gluten-free dinner ideas to…...

Nov 10, 2023

Free delivery or pickup on your first order of $35 or more. Sign up now! Terms apply.