To prepare chiles en nogada, you'll need: 1 pound stuffed poblano peppers 1 cup chopped walnuts Instructions Preheat the oven to 375 degrees F. Line a baking sheet with foil and brush with olive oil. Cut each pepper in half lengthwise and scoop out the seeds. Place the pepper halves in the prepared baking dish. Fill each half with the stuffing mixture. Bake for 20 minutes or until the filling is heated through. Serve with sour cream and guacamole.