You can reheat an omelette using the following methods:- Microwave - this is by far the most popular method as it is very quick and easy. Wrap the omelette in a paper towel, place it in a microwave-safe container, and warm for 1-2 minutes (slightly more, in 30-second increments, if your omelette is frozen). Flip halfway through heating. Oven - line a baking tray with parchment paper and heat your oven to 350°F (approximately 180°C). Bake the omelette for 10 minutes or until the inside is warm enough and no longer cold. Stovetop - add butter or cooking oil to a pan or skillet and allow this to heat under medium heat. Warm for 2 minutes on each side. Air fry - similar to the oven, set the air fryer to 350 degrees Fahrenheit (about 180°C). Grease the basket using a non-aerosol cooking spray or use a parchment paper then heat for 5-10 minutes, or until warmed through. Check on it halfway through heating.