The win was Madrid's fourth in five La Liga matches - with the other result a 2-2 draw at Barcelona - and they are showing signs of the form that won them the league title last season after a sluggish start to the season.
"I think we're doing really well even though we lost in the last Champions League match," Mourinho told the club's official website.
"Since the match in Seville we have been winning matches, but although we are still not playing as great as we did for virtually the whole of last season, it was enough to win comfortably.
"We scored the first chance to score and it made the match easier. Sometimes we need lots of chances to score and this time we scored the first, and the second the same and things got easier."