Take 2-5 red bell peppers and slice the tops off. Remove stem, seeds, and pith and then slice into thin rings.
Setup your smoker to the lowest temperature setting or use a cold smoking device. 
Put sliced pepper rings on trays and then put into your smoker.
Smoke for 2-3 hours.
After smoking, set your dehydrator to ~140F.
Put smoked peppers on dehydrator trays and dehydrate for 16-24 hours. 
The next day, take 1 out and allow to cool for 5 minutes. It should feel brittle and snap. If it's soft and pliable, it needs to keep dehydrating.
Once dry, put into a spice grinder or pestle and mortar and grind into a fine powder. 
Store in a freezer ziploc bag or glass storage container.