Place the dulce de leche, cream and butter in a microwavable bowl.
Microwave for ten to fifteen seconds and stir.
Prepare the filling
Peel the apples, cut off the cores and slice thinly.
Melt one tablespoon butter in a pan.
Add the apples and sugar.
Cook over medium heat until the sugar starts to melt.
Stir and continue cooking, flipping the apples slices once in a while, until they are lightly browned.
Cook the crepes
Heat a crepe pan (a shallow non-stick pan will do too).
Pour just enough batter to cover the bottom of the pan (see notes after the recipe).
Using a crepe spatula, spread the batter in a circular motion to make it as thin as possible (or tilt the pan in all directions immediately after pouring in the batter to allow it to spread evenly).