This was done out of curiosity, in response to a hypothetical question which I posed to myself one day: had apples been as easy to find and inexpensive as bananas in Thailand, would we batter-fry them like we do bananas? After this experiment, I would say yes.
To make these, you can follow either one of these recipes: Thai fried bananas or Thai fried sweet potatoes (มันทอด), replacing the bananas and sweet potatoes respectively with the same amount of apples that have been cored and sliced crosswise into 1/4-inch thick rings. The latter is a bit less complicated than the former, but both yield great results.
Depending on the type(s) of apple you use, you may or may not need to serve these fritters with a drizzling sauce. I made these with Gala apples and found the level of sweetness to be perfectly fine. But if you like a sauce to go with the apple fritters, I recommend either honey or the panela-coconut sauce which I use on Thai-style pressed grilled bananas.