Pre-bake the pie crust. Lay the 1 prepared raw pie crust in a pie pan, crimp the edges, and use a fork to poke holes in the bottom. Set a sheet of parchment paper on top of the crust and weigh it down with pie weights or sugar.Pre-bake the crust according to package instructions. Allow the pie crust to cool while you make the filling.
Make the filling base. In a medium non-stick saucepan, combine the ¾ cup dark brown sugar, 2½ Tablespoons cornstarch, ½ teaspoon salt1½ Tablespoons cinnamon and 2½ cups whole milk. Bring the mixture to a light simmer over medium heat and then reduce the heat to low. Cook until thickened, about 7 minutes, stirring occasionally.
Temper in the egg yolks. In a small mixing bowl, very slowly whisk together the 6 egg yolks, and ¼ cup of the milk mixture. Slowly whisk the egg mixture into the bulk of the milk mixture.Cook, stirring consistently, for 3 minutes or until quite thick. The texture should be like thick pudding when ready.
Add some flavor. Remove the filling from the heat and stir in ¾ cup of the butterscotch chips along with the 2 teaspoons vanilla extract and ¼ cup unsalted butter.
Assemble and chill. Smooth the filling into the cooled pie crust and pop the pie in the fridge for at least 6 hours or until set.
Serve. Remove the pie from the fridge, top with the remaining butterscotch chips, and serve with Cool Whip.
Notes
Pie too soft? Make sure when cooking the filling you keep stirring and simmering until it is a nice thick pudding texture to avoid a soft pie.
Can I make this ahead of time and freeze it? You can. Follow the recipe from start to finish. Once it’s set, wrap the whole pie in a double layer of plastic wrap and store it in the freezer for up to 3 months. Allow the pie to thaw in the fridge before slicing and serving.
How to Store Butterscotch Pie? Store leftovers in the refrigerator for up to 4 days.