For Fatty Foods, Your Toaster Oven Is Probably Not The Best Bet - Tasting Table
Briefly

Cooking fatty and greasy foods in a toaster oven can lead to safety hazards, such as fires from grease splattering on heating elements due to high temperatures.
The mess created by reheating fatty foods can be a significant issue, as grease splatters can dirty the appliance, stain the cooking tray, and attract pests.
Excessive grease build-up not only makes the toaster oven unsightly, but it can also hinder the performance of heating elements, leading to improperly cooked food.
To maintain kitchen safety and cleanliness, it's advisable to avoid cooking or reheating greasy items in a toaster oven.
Read at Tasting Table
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