How to roast poblanos under the broiler! My least favorite job in the kitchen is cleaning seeds out of roasted poblanos! Then I had this bright idea! Why not remove the stems and seeds ahead of time, before roasting! Hey, now I am onto something great. After removing the stems and seeds from the peppers, place onto a baking sheet that is lined with a raised metal rack. Place under the broiler on high for 8-10 minutes per side or until the skins on the poblanos blister. Transfer to a clean kitchen towel and cover. Once cool, peel and slice! Ta! Da!!