The Northern Ireland striker moved to the Stadium of Light from Fulham in August but has struggled to make an impact in the first team, appearing in only five Premier League games before Saturday.
But he came off the bench in the dying minutes to score the second goal in the 2-0 victory against Stoke, earning high praise from his manger in the process.
Super"David Healy has done super. We had a big chat before the Everton game because we didn't think that he was doing enough," Sbragia said.
"Since that chat, he's been doing absolutely super. We knew he could do more, that there was more to come from him, that the door isn't closed.
"That's one of the reasons we let Michael Chopra go, we thought David was slightly ahead of him
"Credit to him, he's been fantastic. He's got on with it, he's got this gift of scoring goals and being in the right place at the right time."