Mix together cream cheese and Cool Whip until nice and smooth. Use a hand mixer or stand mixer if possible.
Add in the vanilla and brown sugar. Mix well until incorporated.
Chop up the Snickers bars into bite-sized pieces. Gently fold them into the sauce mix.
Before serving, peel and chop the apples into bite-sized pieces. Gently fold them in with the rest of the salad mixture. Serve cold and refrigerate any leftovers.