who wrote simply having a wonderful christmas time

Sir Paul McCartney wrote "Simply Having a Wonderful Christmas Time." It is a song written and recorded by the former Beatle Paul McCartney for his first solo album, "McCartney." It was released in 1970 and was the first single from the album. The song has become a classic Christmas song and is often played during the holiday season. The song is a love song with a festive and cheerful atmosphere. The lyrics describe the joys of a Christmas holiday spent with loved ones, enjoying the simple pleasures of life.