Start by washing the zucchinis thoroughly. Using a sharp knife or mandoline slicer, slice the zucchinis into very thin rounds — about 1/8-inch thick.
In a medium bowl, combine the distilled white vinegar, water, sugar, kosher salt, garlic powder, onion powder, dried dill, black pepper, and crushed red pepper flakes. Whisk until sugar and salt are dissolved.
Place the sliced zucchini into a large jar or airtight container. Pour the prepared brine over the zucchini slices, ensuring all slices are submerged. Add the tablespoon of olive oil on top.
Seal the container tightly and refrigerate for at least 24 hours. Let the chips marinate up to 48 hours for best results.
Once marinated, serve chilled as a snack or alongside salads, sandwiches, or grilled dishes.