Wash and dry the red chilies completely
Remove the stems
Slice the chilies open if needed
Remove seeds if you want milder flakes
Dry the chilies fully in sunlight, oven, or dehydrator until brittle
Let the dried chilies cool completely
Crush them by hand, with a mortar and pestle, or in a blender
Pulse lightly to keep a flaky texture
Sieve if you want to separate fine powder from flakes
Store the chili flakes in an airtight container
Keep the container in a cool, dry place