Nick Cushing’s side lifted the trophy in front of a 43, 265 strong crowd after a second half blitz which West Ham United were unable to live with.
And it was Walsh who kick-started that, opening the scoring with a long-range effort in the 52nd minute, before Georgia Stanway and Lauren Hemp guaranteed the trophy was decorated with blue and white ribbon.
Read | Dream Wembley debut for Hemp
Only her third goal for the Club, the lifelong City fan spoke of her pride at scoring on the grandest stage of all.
“I normally leave it to Nikita to score,” she joked. “But it’s special to score at Wembley.
“It’s more important that the team got the win, but if I can help by scoring that’s great.
“It’s a nice victory at Wembley for us.”
Parris, who like Walsh started when City lifted the trophy in 2017, also acknowledged the significance of winning at the famous stadium as she paid tribute to her team-mate for netting the nerve-settling first goal after a tense opening 45 minutes.
“It’s amazing to win 3-0 at Wembley and a great achievement to win the FA Cup again,” added the FA WSL’s all-time top scorer.
“Congratulations to Keira for her goal, she got us on the scoresheet and it’s a great win.
“We could have scored more, but we came here to win and that’s what we’ve done.”