One method is to apply cream highlighter first and then layer powder highlighter on top. If you have oily skin, just use powder highlighter to avoid looking excessively shiny. Check out a video tutorial from Desi Perkins here!
Drugstore: Maybelline (available on Amazon for $6.35+)
High-end: RMS Beauty (available on Sephora for $38)
Drugstore: Physicians Formula (available on Amazon for $8.29+)
High-end: Becca (available on Sephora for $38)