Slice the plantains thinly with the help of slicer/ mandolin for consistent results. Or you may use a sharp knife and still with good results.
Spread out sliced plantains in a single layer on large baking pan, sheet or flat surface
Let it dry for about 3-5 days, be sure to turn it on the other side after about a day to lessen the drying time.
Remove and place in food processor or coffee blender- blend in batches until all the dried plantains are finished. If the flour is not fine enough – you may use a sieve to filter out the grainy part. If you use a coffee grinder you do not have to go through this process