Slice eggplant very thin - this is the trickiest part. If you have a mandoline, definitely use it. If not, do the best you can to get thin (⅛ in) uniform, consistent slices. If they are too thick, they won’t crisp up.
Sprinkle with sea salt and let them ‘sweat’ (draw out water) for about 30 minutes. Take some paper towels and soak up as much water as you can (this step is not necessary, but the less water, the easier they will crisp up).
Spray a baking dish with the cooking spray - alternatively you could line the pan with foil or parchment paper and spray that for easier clean up as some of the gooey middle might stick - and place the eggplant slices on the pan being careful not to overlap.
Lightly spray the tops and sprinkle with spices of your choice.
Bake for 20 minutes, then flip slices and bake an additional 10-20 minutes or until they begin to brown and curl up. They should be starting to harden a bit, and may still feel a little soft, but will crisp up very nicely a few minutes out of the oven.
Notes
This is just the base recipe. I highly encouraged you to experiment with different herbs and spices to your preferences. I personally like a bit of heat, but perhaps you are more an onion/garlic kind of person. Spices provide a host of health benefits and don’t alter the nutrition content (ie carbs, calories etc) negatively.Add other seasonings as desired: rosemary, garlic powder, pepper, paprika, parsley, oregano, turmeric, ginger etcEvery oven cooks a bit differently. If you have problems with sticking or burning, you might try reducing the heat and baking them for longer. Additions:An alternate way of doing these is in a dehydrator if you have one. The nice thing about the dehydrator is that it induces crispness through extracting water rather than adding heat. So you don’t need to use oil as they won’t stick and they will last longer if sealed and kept in an airtight container, since the moisture has been removed. I’ve dehydrated chips and they’ve stayed crisp several months in mason jars!Storage:Chips should be eaten immediately or stored airtight for a few hours. They will likely be soft the next day depending on how much moisture has been baked out. If prepared in a dehydrator they will last much longer!