I was happy to find sweetened condensed coconut milk works great for these! (meaningfuleats.com)
Pour remaining 1/2 of condensed coconut milk over the top of the layers. (simplylivinghealthy.org)
* if you're looking for dairy free / kosher alternatives, here is a recipe for condensed coconut milk and here is a recipe for homemade dairy condensed milk. (mynameisyeh.com)