The best way to reheat leftovers safely
Reheat leftovers rapidly to 165°F throughout. Cover and rotate microwave portions, stir liquids and casseroles, and verify at least two places with a food thermometer.
On this page
Cold spots are the main risk. Spread food to an even depth, add moisture when appropriate, cover, stir or rotate, and measure the center and another thick area.
Which method should you use?
Materials and equipment
1 refrigerated portion
Materials
Equipment
- Microwave-safe dish
- Vented microwave-safe cover
- Spoon
- Instant-read thermometer
Use leftovers within 3–4 days. Discard food that exceeded safe holding limits; reheating does not reliably make mishandled food safe.
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Safety boundaries
- Reheat leftovers to 165°F throughout.
- Bring sauces, soups, and gravies to a rolling boil while stirring.
- Do not use a slow cooker to reheat cold leftovers because it can heat too slowly.
Rapid, covered reheat to 165°F
Arrange
Spread food in an even layer in a microwave-safe dish; add 1–2 Tbsp water if appropriate.
Look for No dense mound.
Cover and heat
Cover with a vented lid and heat on high for 60–90 seconds per portion.
Look for Steam builds under the cover.
1:15 suggested timingStir and stand
Stir or rotate, heat in 30-second intervals, then stand covered 2 minutes.
Look for Temperature equalizes.
2:00 suggested timingVerify
Measure at least two places and continue until both reach 165°F.
Look for No cold spot below 165°F.
Fix common problems
Checking only the hottest edge or relying on steam instead of measuring the coldest part.
One spot is below 165°F? Stir or rotate, heat again in 30-second microwave intervals or 2-minute oven intervals, then recheck.
Food is drying before it reaches 165°F? Add 1–2 tablespoons water or sauce, cover, and lower the heat slightly.
Common questions about this method
Is steam enough to show that leftovers are safe?
Can I use a slow cooker to reheat refrigerated food?
Use a stove, microwave, or oven to reheat to 165°F first. A slow cooker can heat chilled leftovers too slowly; follow its instructions if using it to hold already hot food.
Other methods, in full
Open any method to read its preparation and steps side by side with your current choice.
Best textureAbout 30–45 min, including preheat
For 2–4 refrigerated portions, spread leftovers in a shallow oven-safe dish, add a little water or broth if suitable, and cover. Reheat in a 325°F oven, stirring when practical. Start checking around 15–25 minutes and continue until the center and another thick area both reach 165°F.
Preparation
2–4 refrigerated portions
Materials
- Properly refrigerated leftovers
- Small amount of water or broth, if suitable
Equipment
- Shallow oven-safe dish
- Lid or foil
- Oven
- Spoon
- Instant-read thermometer
- Dry oven mitts
Use a 325°F / 163°C oven or hotter and check the thickest areas. Dense casseroles and larger portions may take longer than this starting estimate.
Preheat
Heat oven to 325°F.
Look for Oven is fully preheated.
Prepare
Spread leftovers in a shallow oven-safe dish; add moisture and cover.
Look for Even depth under 2 inches.
Heat
Bake 15–25 minutes depending on density, stirring halfway when possible.
Look for Center is steaming.
20:00 suggested timingVerify
Check the center and another thick area for 165°F.
Look for Both readings reach 165°F.
Adapt to your setup
Sources behind the method
Evidence status: Based on the linked sources. Best Way has not physically tested this method.
Sources open in a new tab. Verify important safety guidance with the linked authority and your product manufacturer.
Based on published sources
Based on the linked sources. Best Way has not physically tested this method.
Updated 2026-09-05. Added microwave and oven preparation with stirring, standing, and thermometer checks. Read our testing standards →
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