The Internet has been so over-saturated with the geeky cake phenomena [1] that I have been totally brainwashed into thinking that everything edibly geek must be sweet. Not so, says the "1Up Mushroom" Mushroom Burger [2]!
The only edible 1Up mushroom treat that I had spotted before was these candy sours [3], but now my mouth is watering for red meat, mozzarella, and portobello mushrooms. And some green food coloring for the caps, too, obviously.
Source [4]