Start by slicing your avocado half into thin, uniform slices about 1/8-inch thick. Be gentle to avoid mashing the avocado.
In a mixing bowl, combine the all-purpose flour, baking powder, and a pinch of salt. Stir until well mixed.
Using a pastry brush or your fingers, lightly coat each avocado slice with the flour mixture. Ensure even coverage without overcoating.
Place the coated avocado slices on a prepared baking sheet in a single layer without overlapping.
Preheat oven to 350°F (175°C). Bake the avocado slices for 12 to 15 minutes, flipping halfway through for even golden browning. Watch closely near the end to avoid burning.
Remove from oven and transfer chips to a cooling rack to keep crisp. Enjoy immediately or store for later.