It depends on the track, but: EQ + Compression + Reverb is pretty much how I usually go about mixing back in the vocals. I like to add a "de-esser" plugin before the reverb too just to make any "sss" sound on the highend less harsh. If I feel like it I might do a bit of parallel processing too, but again it really depends on the track and how I want to work with it.
Everything I said above pretty much follows this:
https://www.youtube.com/watch?v=j-Ggk2zBl4AVideo on 'Parallel Processing' if you don't know what it is:
https://www.youtube.com/watch?v=ehY4Yr0jom0