Turn on the air fryer for 220 degrees C (428 F) for 10 minutes
Cut lengthwise, slice into sticks a little more than half a cm wide, and place in a medium bowl to make it easy to mix.
Mix cornstarch and water in a small bowl and put in the microwave on high power for a minute; stop and mix, and if necessary, return to the microwave for a few more seconds - until you get a smooth cream not too thick. You can thin it with water if it turns out too thick.
Remove from the microwave, add oil, salt, sweet paprika, and chili powder, and mix well.
Add the mixture to the bowl with the potatoes and mix with your hands until all the potatoes are covered.
Transfer to the frying basket: arrange the slices so that they do not touch each other * (note at the end), and put in the air fryer.
After about seven minutes, check with tongs the degree of browning: turn one or two chips and check if the bottom is nicely browned; Turn the chips over and continue frying for another five to seven minutes until the chips are nicely browned on all sides.
Remove from the device, immediately sprinkle more salt to taste, and serve with mayonnaise, ketchup, or your favorite sauces.