Step 1: Prepare the Pie Crust
If using a homemade crust, roll it out and fit it into a 9-inch pie pan. Pre-bake the crust according to your recipe or package instructions until golden brown, usually around 10-15 minutes. Allow it to cool completely before adding the filling.
Step 2: Make the Butterscotch Filling
Melt the Butter: In a medium saucepan over medium heat, melt the ½ cup of unsalted butter. Be careful not to let it brown.
Combine Sugar and Salt: Once the butter is melted, whisk in 1 cup of packed brown sugar and ¼ teaspoon of salt. Continue to whisk until the sugar has dissolved and the mixture is smooth.
Mix Egg Yolks and Cornstarch: In a separate bowl, whisk together 3 large egg yolks and ¼ cup of cornstarch until well combined.
Incorporate Milk and Cook: Gradually add the 2 cups of whole milk to the butter and sugar mixture, continuing to whisk until smooth. Add the egg yolk mixture gradually while whisking constantly.
Thicken the Filling:
