Aspinall – roared on by a capacity crowd in Gottingen – produced a series of heroic displays on Finals Day to claim his first PDC title since his World Matchplay triumph in July 2023.
The Stockport star averaged 98 and crashed in five 180s to defeat Joyce and pocket the £30,000 top prize at the Lokhalle, as he became the 38th different player to win a European Tour event.
Having kicked off his campaign with a last-leg victory over European Champion Ritchie Edhouse, Aspinall came through another decider to sink Jermaine Wattimena in an exhilarating last 16 affair.
He then averaged 106.72 in a 6-1 demolition of world number one Luke Humphries, before edging out Gary Anderson in an epic semi-final – aided by a skin-saving 170 finish in the penultimate leg.
Aspinall continued from where he left off to race into a 4-1 lead against Joyce, and although the Newcastle thrower reduced the arrears to a solitary leg at one stage, Aspinall proved too strong.
Joyce – like Aspinall – also broke new ground this weekend, defeating four televised title winners to advance to his maiden European Tour final.
The 39-year-old kicked off his campaign with a whitewash victory against Joe Cullen on Friday, before dumping out Belgian number one Dimitri Van den Bergh in round two.
Joyce continued his charge with hard-fought wins over world number four Rob Cross and Cameron Menzies, which he followed with a superb 7-5 success against Michael van Gerwen in the semi-finals.
Van Gerwen prevailed on the European Tour’s last visit to Gottingen in 2019, and the Dutchman overcame Niko Springer, Gian van Veen and Gerwyn Price in his run to the last four, defying a 107 average from Price in the process.
Anderson joined his great rival Van Gerwen in the semi-finals, following up his comeback win over Luke Woodhouse with deciding-leg victories over Martin Schindler and Ross Smith on Finals Day.
Former European Champion Smith made up the quarter-final line-up alongside Humphries, Menzies and Price, who averaged over 110 in his third round success against Wessel Nijman.
The PDC ProTour will resume with Players Championships 9-10 in Leicester on March 31-April 1, before the European Tour season continues with the International Darts Open in Riesa from April 4-6.
Elten Safety Shoes European Darts Trophy
Sunday March 23
Afternoon Session
Third Round
Cameron Menzies 6-5 Mike De Decker
Ryan Joyce 6-4 Rob Cross
Gerwyn Price 6-3 Wessel Nijman
Michael van Gerwen 6-4 Gian van Veen
Ross Smith 6-4 Dave Chisnall
Gary Anderson 6-5 Martin Schindler
Nathan Aspinall 6-5 Jermaine Wattimena
Luke Humphries 6-5 Michael Smith
Evening Session
Quarter-Finals
Ryan Joyce 6-3 Cameron Menzies
Michael van Gerwen 6-4 Gerwyn Price
Gary Anderson 6-5 Ross Smith
Nathan Aspinall 6-1 Luke Humphries
Semi-Finals
Ryan Joyce 7-5 Michael van Gerwen
Nathan Aspinall 7-6 Gary Anderson
Final
Nathan Aspinall 8-4 Ryan Joyce