One of the all-time great quickie appetizers, and a hit and run post for the day.
Get a good green Haas avocado. Make sure it's ripe. Slice it in half. Remove the pit. While the avocado is still in the skin, slice each half's contents lengthwise into 6 or 8 long thin slices.
Use a spoon to scoop out the slices. If you're careful, they should come out intact.
Sprinkle lime juice (a teaspoon or so) and chili powder (a 1/2 teaspoon or so) over the mix. Serve as is with a fork or transfer onto corn chips for easier eating.
If you're a salt addict you can sprinkle a pinch of kosher salt over the whole plate, too.
The lime should prevent browning, and the chili gives it a nice little kick. Yum.