Preheat the oven to 400° F. Slice the tops off the peppers and remove the seeds. Then cut each pepper in half lengthwise.
Grease a baking sheet with olive oil cooking spray and place the peppers flesh side down. Roast for 40-50 minutes, until peppers are soft and skin is charred. Remove the peppers from the oven and allow them to cool for 10 minutes before removing the skin.
Remove the peppers from the oven and allow them to cool for 10 minutes before removing the skin. Use your hands to gently peel and remove loose skin from the peppers.
Slice the peppers into 1 inch strips and store in a jar with a tight-fitting lid. Fill the jar with extra virgin olive oil, sprinkle with sea salt, and store in the refrigerator for 2-3 weeks.