Preheat oven to 400°F.
Shuck the clams. If using littlenecks, leave whole. If using larger top necks or cherrystones, chop the meat into ½" pieces with kitchen scissors.
Arrange approximately half of the empty clam shell halves on a baking sheet and fill with the chopped clam meat. Use extra shells to wedge under the shells to keep level and keep juices from running out.
Generously cover the clam meat with the breadcrumb mixture, about 1-2 TBS per clam.
Lightly coat the breadcrumbs with olive oil.
Bake for 15 minutes or until the breadcrumbs start to toast.
Serve with lemon wedges and spoons.