6 large onions, peeled and sliced
2 teaspoons dried basil
1 1/2 teaspoons salt
1 tablespoon Worcestershire sauce
1/2 cup water
1/2 cup milk
1 teaspoon dried parsley
1/3 cup butter, chilled, divided
1 (8 ounce) package cream cheese, softened
1/2 teaspoon butter, divided
1 (8 ounce) can cream-style corn soup mix
1 (2.25 ounce) can whole kernel corn
1 egg, beat
1/4 cup shredded Cheddar cheese