Preheat your air fryer to 400°F (200°C) for about 5 minutes.
While the air fryer is preheating, let the filet mignon come to room temperature. This helps the steak cook more evenly.
Season the steak generously with salt and pepper. You can also add some fresh herbs like thyme or rosemary for extra flavor.
Lightly coat the steak with a small amount of olive oil. This helps with browning and prevents it from sticking to the air fryer basket.
Place the steak in the air fryer basket. Make sure there is enough space around it for air to circulate.
Cook the filet mignon in the air fryer at 400°F (200°C) for about 10-15 minutes. Cooking time will vary depending on the thickness of the steak and your desired level of doneness. Here are some rough guidelines:
Rare: 10 minutes
Medium-rare: 12 minutes
Medium: 14 minutes
Medium-well: 16 minutes
While the steak is cooking, melt the butter in a small saucepan or in the microwave. Add the minced garlic to the melted butter and let it infuse for a few minutes.
When the steak is done, remove it from the air fryer and let it rest for a few minutes. Resting allows the juices to redistribute, making the steak more tender and flavorful.
Drizzle the garlic butter over the cooked filet mignon just before serving. You can also serve it on the side as a dipping sauce.
Enjoy your air-fried filet mignon with garlic butter!