If you are using the latest version l;.you don’t have to add experimental = true to it.

in Project level Gradle

classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.21'

And in app level Gradle

apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions' //These should be on the top of file.

and in dependencies..

implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.21'

and import below as

import kotlinx.android.synthetic.main.your_layout_file_name.view.*

and example

import kotlinx.android.synthetic.main.item_animal.view.*

class AnimalVH(parent: ViewGroup, layoutID: Int) : BaseViewHolder<Animal>(parent, layoutID) {

    override fun bindData(animal: Animal) {
        itemView.tv_animal.text = animal.title
    }
}

where BaseViewHolder is

abstract class BaseViewHolder<T>(parent: ViewGroup, layoutID: Int) : RecyclerView.ViewHolder(
    LayoutInflater.from(parent.context).inflate(layoutID, parent, false)
) {
    abstract fun bindData(model: T)
}