How can I get the inner type of a generic class in Kotlin?

I know with Kotlin (on the JVM) I can get the type of a class with foo::class. And I know I can generic information, even at runtime, with typeOf<>() (as long as my function is inline). But I can't figure out how to get Int from a List<Int> for example.

Here's as far as I can get:

import kotlin.reflect.KType
import kotlin.reflect.typeOf

fun main() {
    TypeTest.get<Int>()
    TypeTest.get<List<Int>>()
    TypeTest.get<Map<String, List<Int>>>()
}

class TypeTest {
    companion object {
        @OptIn(ExperimentalStdlibApi::class)
        inline fun <reified OUT : Any> get() {
            generateReturnType(typeOf<OUT>())
        }

        fun generateReturnType(type: KType) {
            val classifier = type.classifier!!
            println("class $classifier has parameters ${classifier::class.typeParameters}")
        }
    }
}

This prints:

class class kotlin.Int has parameters [T]
class class kotlin.collections.List has parameters [T]
class class kotlin.collections.Map has parameters [T]

Given a KClassifier, how can I get its inner type (ideally recursively, in the case of a List<List<Int>>)? Or is there another way to do this?