The album was broadly similar to
Fleetwood Mac's
self-titled debut album, albeit with some changes to personnel and recording method. The album was recorded live in the studio with miked amplifiers and PA system, rather than plugged into the board. The vocals were distorted with a
Vox amplifier and most of the album was recorded in
mono. A
horn section was featured throughout the album and
Christine Perfect (later Christine McVie) of
Chicken Shack played keyboards.
Mike Vernon, who served as the producer on the album, placed
baffles and wooden partitions between the instruments to avoid
audio spill.
Peter Green's material on the album was recorded on 28 April 1968, the same day that the band re-recorded their cover of "
Need Your Love So Bad". One song from that session, "
Stop Messin' Round", was recorded in five takes. "Rollin' Man", "Love That Burns", "If You Be My Baby", and "Lazy Poker Blues" were also recorded that same day. Green remembered that
Jeremy Spencer opted not to play on his tracks on
Mr Wonderful. Clifford Davis received writing credits on Green's songs under the name C.G. Adams; Green told
Guitar Player magazine in a 1994 interview that Davis did so as a "tax dodge". A second session was booked to record six tracks sung by Spencer, who granted the horn section leeway when determining what to play on his compositions, telling them to "just blow". The album took a total of four days to record. "Trying So Hard to Forget", the album's final song, was a duet between Green on guitar and
Duster Bennett on harmonica. A few months later, Green told
Nick Logan in an interview with
NME that the album would bear a greater resemblance to their live shows than their
self-titled album. He said that his harmonica playing would be less prominent on
Mr. Wonderful in comparison to the band's debut album and also mentioned that several other musicians, including Perfect and
Stan Webb, would appear on his songs. Certain songs on
Mr. Wonderful, including "Stop Messin' Round", "Lazy Poker Blues", and "Love That Burns", were performed live with members of the band
Chicken Shack prior to the album's release.
John Peel wrote some passages in the album's liner notes, which included commentary about the band members. ==Title and cover art==