Swansea winger Cotterill broke the deadlock on 35 minutes volleying home Robert Earnshaw's cross.
Robert Earnshaw then doubled Forest's advantage when the Welshman turned home Matt Thornhill's misdirected shot.
Earlier, Earnshaw had hit the post for the visitors after exchanging passes with fellow striker Blackstock.
"The Paddy Considine character is in the line of sight in a crowded station, " says Mr Earnshaw.
He was free to strike as the Azerbaijan defence failed to deal with Robert Earnshaw's right-wing cross.
Earnshaw had an excellent chance in the 70th, but fired a shot from close in right to Robles.
Rob Earnshaw gave Wales the perfect start by scoring the opener on 13 minutes from Craig Bellamy's pass.
Rob Earnshaw's 26th-minute penalty proved enough, confidently converted after a harsh handball decision against Estonia captain Alo Barengrub.
Rob Earnshaw relished the senior Wales striker role in Craig Bellamy's injury absence, while Aaron Ramsey also shone.
Earnshaw then wasted a great chance before half time by dragging his shot wide from Aaron Ramsey's accurate pass.
Wales captain James Collins had a header cleared off the line while Rob Earnshaw saw a close-range shot saved.
Excellent work from Contra on the right flank resulted in a low cross which an unmarked Earnshaw gratefully converted.
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The goal was reward for Burnley edging the first half, during which Forest's Rob Earnshaw also struck a post.
Thomas Earnshaw, 24, of Newark Road, Syke, Rochdale, received eight weeks in prison, suspended for two years, and 120 hours unpaid work.
Richardson burst down the right-hand side and played Robert Earnshaw through but the Wales international shot wide from 12 yards.
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Robson made a surprising double substitution on the hour, replacing Zoltan Gera and Earnshaw with Geoff Horsfield and Rob Hulse.
BBC: SPORT | Football | Premiership | West Brom 1-2 Middlesbrough
Wales manager John Toshack added further pace by putting Rob Earnshaw on up front in place of a subdued Freddy Eastwood.
Better work from Earnshaw saw the Welshman fashion an opening after nine minutes, but Van der Sar was equal to the shot.
Nottingham Forest's Earnshaw, 29, said Cardiff needed promotion more than the Seasiders.
Toronto had a couple of scoring chances, the first coming off a long shot from Robert Earnshaw that sailed high of the net.
However, there was reassurance for Koumas' Wales team-mate Rob Earnshaw that the striker has a big part to play in Robson's West Brom plans.
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Robert Earnshaw was sent on for the second half to give Eastwood more support, and the change seemed to give Wales more attacking impetus.
Former Cardiff player Earnshaw enjoyed his return to Ninian Park, getting a standing ovation from the Bluebirds fans and hitting the bar with a free-kick.
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Ronnie Wallwork's shot then caused further consternation for Fulham as it was parried by Van der Sar and Earnshaw was only just unable to convert.
Earnshaw says out-of-contract Ledley has a "huge" career decision to take.
Rob Earnshaw had Wales' first sight on goal when he headed over from Simon Davies' cross, and then Carl Fletcher's 20-yard low drive went just wide.
With an average age of 21, seven of the starters still qualify for the Under-21s, with Earnshaw the oldest at 28 and earning his 44th cap.
Debutant Kevin Campbell forced a fine save from Fulham keeper Edwin van der Sar as he broke clear, and Rob Earnshaw also had a close-range shot saved.
But the withdrawal of captain Craig Bellamy - to be with his pregnant wife - means Eastwood will start in attack, probably in tandem with Rob Earnshaw.
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Earnshaw nearly got Wales back in the game minutes later as he wiggled between three defenders, but Enke got an instinctive right hand to the powerful shot.
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