In a nonstick skillet, saute onions and garlic in oil until tender. Add the scallops, parsley and basil; cook and stir over medium heat until scallops are firm and opaque. Add the vermouth or broth, salt and pepper; cook, uncovered, over medium-low heat for 1 minute.
Divide mixture evenly between 2 ovenproof 1-1/2-cup dishes. Sprinkle with bread crumbs; dot with butter. Broil 4-6 in. from heat until scallops are firm and opaque and bread crumbs are golden brown.
To make soft bread crumbs, tear bread into pieces and place in a food processor or blender. Cover and pulse until crumbs form. One slice of bread yields 1/2 to 3/4 cup crumbs.