Mexican Dulce de Leche Cheesecake

Source: Dulce de Leche Cheesecake : Pati’s Mexican Table

INGREDIENTS
For the crust:
1 1/2 cups finely ground Maria cookies, vanilla wafers or graham crackers
6 tablespoons unsalted butter, melted, plus more for greasing the pan

For the cream cheese filling:
1 pound cream cheese, at room temperature
1 14-ounce can La Lechera sweetened condensed milk
3 large eggs, at room temperature

For the dulce de leche topping:
1 1/2 cups sour cream
1 14-ounce can La Lechera dulce de leche
1 cup chopped pecans