Preheat oven to 425°.
Place pie crust into pie plate and shape edges.
Add pumpkin, eggs, sweetened condensed milk, pumpkin pie spice, salt and pepper to a bowl and mix until well combined.
Pour into crust.
In clean bowl, add eggs, brown sugar, melted butter, flour, baking soda and salt.
Mix until combined.
Carefully pour over pumpkin mixture.
Layer pecan halves over top.
Cover with parchment paper or foil.
Place on a baking sheet and bake for 15 minutes.
Lower oven temperature to 350°.
Bake for another hour or until both layers are set.
Remove to a wire rack to cool completely.
Chill until ready to serve.