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Preheat the oven to 450 degrees F.
Cut the peppers in half and remove the stems, seeds and membranes. Lay the peppers on a foil-lined baking sheet, cut side down. Roast the red peppers for 15-20 minutes or until the skins are very dark and have collapsed. (There is no need to rotate or turn the peppers.) Once the skins are blackened remove the peppers from the oven.
At this point most people recommend placing the roasted peppers in a paper bag to steam for about 10 minutes to help loosen the skin. I've never found that to be necessary, but I guess it depends on how stubborn your particular peppers are! Simply let the peppers cool for a few minutes until comfortable enough to handle and then peel the skins off and discard them.
You can slice or dice the peppers in advance or store them in halves. Stored in the fridge in an airtight container they'll keep for up to about a week. If you store them covered in oil in the fridge they'll keep for at least 2 weeks. For longer storage you can freeze them in ziplock bags.