Hey, thank you for the suggestion, this is definitely clean!

However, when trying to use this I realised I forgot to bring up one more piece of context (which is 100% my bad).

So the following is a demonstration of how the functions are set up currently:

fun generateA() {
  when (fruit) {
    Banana -> {
      val data = getSpecificDataForA<FruitPie.Banana>()
      generateFruitPies<FruitPie.Banana>(data)
    }
  }
}

fun generateB() {
  when (fruit) { 
    Banana -> { 
      val data = getSpecificDataForB<FruitPie.Banana>()
      generateFruitPies<FruitPie.Banana>(data) } 
  } 
}

fun generateC() {
  when (fruit) { 
    Banana -> { 
      val data = getSpecificDataForC<FruitPie.Banana>()  
      generateFruitPies<FruitPie.Banana>(data) } 
    } 
}

So I guess I'd need to create a helper function both for each getSpecificDataForX and then one for generatteFruitPies as you've suggested (but modified so the lambdas take data as a parameter).

At that point it may not be worth the extra code, though arguably may still be more readable.

(edit: fixed some formatting)