If your air fryer requires a preheating cycle, be sure to run that at 350ºF before arranging the bacon in your air fryer basket. This way the bacon won't overcook later. Once the basket is ready, arrange the bacon in an single layer, without much overlapping. (Typically, only 4-5 strips will fit in an air fryer basket. You can fit more in a larger oven-style model.)
Cook the bacon in the air fryer at 350ºF for 10 minutes, for thick-cut bacon. If your bacon is on the thinner side, start with just 8 minutes, since it will cook faster. You can flip the bacon halfway through the cooking cycle, but it's not necessary since air will circulate under the bacon, as well. Note: If you are using an oven-style air fryer, be sure to place a rimmed baking sheet under the air fryer basket to catch the bacon grease as it drips. This will make clean-up easier and prevent any smoking from your air fryer.
Once the cooking cycle is complete, check on the bacon. It may be ready to eat right away, or it might need 2 more minutes of cooking time to finish crisping up. When it looks crispy, use a fork or tongs to remove the bacon and let it cool on a towel to absorb any excess grease. It will crisp up more as it cools, then it's ready to serve.
To render the bacon grease, arrange a fine mesh sieve over a glass storage jar. While the bacon grease is still warm (and in a liquid state) pour it from the rimmed pan or the bottom of your air fryer basket, through the sieve to catch any small bacon pieces as it goes into the jar. Store it sealed in the fridge for up to 3 months. It will thicken when chilled, similar to the texture of softened butter.
Notes
Nutrition information is for roughly 1 slice of bacon, but this will vary based on the thickness and brand of bacon that you choose. Be sure to refer to the package you use for more accurate information, as this is only an estimate and not a guarantee. (This information also doesn't account for the bacon fat that is lost during the cooking cycle.)