Preheat oven to 350°F. Place pie crust in pie plate.
Beat eggs in a medium bowl. Stir in dulce de leche and butter; mix well. Stir in nuts.
Sprinkle morsels over bottom of pie crust. Pour egg mixture over morsels.
Bake for 30 to 35 minutes or until knife inserted in center of pie comes out still slightly sticky. Cool completely on wire rack. Serve at room temperature or refrigerate. Garnish with fresh whipped cream, if desired.