Prepare medium-sized bowl with ice water. Using mandolin or sharp knife, carefully cut potatoes into thin chip-like slices. Add slices to ice water to rinse off starch, then pat slices dry. Toss potato slices with remaining 1 Tbsp olive oil, parsley, dill, garlic powder, and salt. Arrange potato slices on parchment-lined baking sheet as evenly spread out as possible and bake for 15 to 20 minutes, flipping halfway through.