@pastelfluffyfox I don't often bother and am far from an expert but I use the following:
* L.A. Girl HD Pro Concealer
* Maybelline Cheek Heat Gel-Cream Blush
* Maybelline Fit Me Powder Foundation
Mustache shadow is the biggest problem for me, so I mostly put concealer on my upper lip and mix it with a bit of the blush as a kind of color corrector to cancel out some of the shadow's blue tones. Then foundation over the whole face, which is enough to mostly take care of the remainder of the beard shadow.
It's not perfect and probably applied all wrong, but it does help a fair bit when I go through the trouble.
