I will not entirely leave the progress of Chelsea in the hands of Cole Palmer right now because the lad has yet to score in 9 if not 10 games now so it's better to advise that they work as a team and deliver to the fans the much needed results.
Everton are also fighting to move a spot higher and even though it will not affect anything on the table, they still want a progress so it's safe to say this game will be tough and like you said that their first leg was settled with a draw, I'm certain that both sides would try to see if they can best the other.
Everton is not a weak team now. We have seen Everton perform well against big teams in several matches. However, I think Chelsea will win this match. The match is important for Chelsea. Chelsea are still trying to qualify for the Champions League. Chelsea are still two points behind Newcastle. If Chelsea can continue their winning streak, then the team has the potential to be in the top 5 of the table. I don't think Chelsea players will make any mistakes in the home match against Everton. I consider Chelsea to be the favorite.