Place 2 cups of blanched almonds inside the blender jar and close the lid.
Blend on high in 15-second intervals, making sure to stop each time, and let the almonds settle as they are chopped. Scrape the sides as needed to move around almonds as they turn into flour.
Once the almonds have a sand-like texture, you've got flour. Sift through a sieve to remove any large pieces.
Use immediately or, transfer the almond flour inside an airtight container and keep in the fridge for up to a week or in the freezer for up to 6 months.
Notes
2 cups of blanched almonds will yield approximately 2.5 cups of almond flour.