The summer arrival from Chelsea struck in the 2-2 draw on Saturday.
“I saw that the gap was there, and I knew that the ‘keeper was on the far side – so I just had to keep it as low as possible and get good contact,” Chalobah told the club's website.
“It was a hard week for us – three games in a week – but I thought the boys really dug in and showed our levels in all of the games.
“The Tottenham game helped boost our confidence going into Villa away, always a place to go. We got a win there and we should’ve done a bit better today, but it’s better than a loss.
“We had plenty of chances to kill the game and obviously in these type of games, when you don’t kill the game, they’ll have chances. We let them in – my mistake, which I’ll learn from myself – and we’ll take the draw and go again next week.”