Why Is My Toaster Oven Smoking? Causes and Fixes

If your toaster oven is smoking, the most common cause is accumulated grease or food debris burning on the heating elements. A quick cleaning and a few minutes of burn-in usually solve the problem. But there are other causes—from manufacturing oils to electrical issues—that you should rule out before using it again.

Quick Answer

Toaster oven smoking is usually caused by grease buildup, food debris, or manufacturing residue. Here are the key facts to know:

Grease & debris: Leftover grease and food particles on the heating elements or the bottom of the oven burn and produce smoke. This is the #1 cause.
Manufacturing oils: New toaster ovens often have protective oils on the heating elements that burn off during first use, causing smoke.
Overloaded crumbs: Crumbs that accumulate under the heating elements can ignite or smolder, especially when cooking fatty foods.
Electrical issues: A faulty heating element or wiring can cause smoking and is a fire risk. Unplug immediately and contact support.

Clean the Heating Elements and Interior

Grease and food debris are the most common culprits. Unplug the toaster oven and let it cool completely. Remove the crumb tray and wash it with hot, soapy water. Use a damp cloth or sponge to wipe the interior walls and bottom. For stuck-on grease on the heating elements, gently scrub with a soft brush or a non-abrasive pad—do not use steel wool, which can damage the elements. Avoid getting water into the heating element openings. Once clean, dry everything thoroughly.

For stubborn buildup, make a paste of baking soda and water, apply it to the affected areas, let it sit for 15 minutes, then wipe clean. Do not use oven cleaners or harsh chemicals inside the toaster oven.

Burn Off Manufacturing Oils (New Ovens)

If your toaster oven is brand new, smoking on first use is normal. Manufacturers apply a protective coating to the heating elements to prevent corrosion during shipping. When you turn it on, these oils burn off and produce smoke and sometimes a chemical smell.

Unpack the oven and remove all packaging materials.
Set up the oven in a well-ventilated area (open a window or turn on a range hood).
Run the oven at 450°F for 15–20 minutes with the door closed.
Let it cool, then wipe the interior with a damp cloth to remove any residue.

After this initial burn-in, the smoking should stop. If it continues, proceed to the next steps.

Check the Crumb Tray and Bottom

An overflowing crumb tray is a classic cause of smoke. Crumbs that fall below the heating elements can get hot enough to smolder or ignite, especially when cooking fatty foods like bacon or pizza. Empty and wash the crumb tray after every use if you cook greasy foods. Also check the bottom of the oven cavity—crumbs can accumulate there even if the tray is in place. Use a vacuum with a brush attachment to clean hard-to-reach areas.

If you use your toaster oven daily, set a reminder to deep-clean the crumb tray and bottom every two weeks.

Avoid Overloading or Using Incorrect Pans

Using pans that are too large or that block airflow can cause food to burn and smoke. Always leave at least 1 inch of space around the pan. Avoid placing aluminum foil directly on the bottom of the oven; it can reflect heat and cause overheating. Instead, place foil on the crumb tray or use a baking sheet. Also, do not line the crumb tray with foil unless the manufacturer allows it—it can trap grease and increase fire risk.

When cooking fatty foods, place a slice of bread under the food to absorb drips, or use a drip tray specifically designed for your model.

Inspect for Electrical Problems

If you’ve cleaned the oven and it still smokes, the issue may be electrical. A malfunctioning heating element can overheat and produce smoke. Look for signs like discolored spots, blistering, or visible damage on the elements. If the smoke has an acrid, electrical smell, unplug the oven immediately and do not use it. Contact the manufacturer or a qualified technician for repair or replacement.

Also check the power cord for damage. A frayed cord can cause short circuits that produce smoke. Never use a toaster oven with a damaged cord.

Pro Tips

Place a slice of bread on the crumb tray to absorb grease drips when cooking bacon or fatty meats.
Run a cleaning cycle with a lemon-water mixture (half lemon, half water) to cut grease and reduce smoke.
Use an oven thermometer to verify the actual temperature; an overheating oven can burn food and smoke.
After cooking, leave the door open for a few minutes to let moisture escape and prevent residue buildup.

Common Mistakes to Avoid

Spraying oven cleaner inside the toaster oven—it can damage the heating elements and leave toxic residues.
Using the toaster oven on a flammable surface like a paper towel or cloth napkin while smoking.
Ignoring persistent smoke thinking it will go away—it could be an electrical fire hazard.
Putting water directly on hot heating elements to stop smoke—this can cause thermal shock and break the elements.

FAQ

Is it normal for a new toaster oven to smoke?

Yes, it’s normal. New toaster ovens have protective oils on the heating elements that burn off during the first use. Run it empty at 450°F for 15–20 minutes in a ventilated area to burn off the residue.

Can I use my toaster oven while it’s smoking?

No. If the smoking is not from the initial burn-in, stop using it immediately. Unplug the oven and clean it. If it still smokes after cleaning, there may be an electrical issue.

Why does my toaster oven smoke only when I cook bacon?

Bacon releases a lot of grease, which can drip onto the heating elements or crumb tray and burn. Use a lower rack position, place a slice of bread under the bacon, or cook on a foil-lined tray to catch drips.

How often should I clean my toaster oven to prevent smoking?

Wipe the interior and empty the crumb tray after every use if you cook greasy foods. Deep-clean the heating elements and bottom every two weeks. For light use, once a month is sufficient.

The Bottom Line

A smoking toaster oven is usually a quick fix—clean the grease, burn off manufacturing oils, and check the crumb tray. But never ignore persistent smoke, especially if it smells electrical. Regular maintenance keeps your toaster oven safe and smoke-free. If problems continue after cleaning, contact the manufacturer or replace the unit.