My Italian husband grew up eating this flavorful sandwich, which his mother used to make it after Saturday chores were finished. Put the sub together a few hours ahead and refrigerate, then serve with chips, veggies and dip for a delicious meal. —Christine Lupella, Fifty Lakes, Minnesota
Cut bread horizontally in half. Hollow out bottom half, leaving a 1/4-in. shell (save removed bread for another use or discard). Brush cut surfaces of bread with oil; sprinkle with Parmesan cheese and oregano.
Layer bottom half with remaining ingredients. Replace bread top. Cut into 8 slices.