Preheat the oven to 350°F (175°C).
Place the premade pie crust into the pie dish and set aside.
In a mixing bowl, whisk together the eggs and granulated sugar until well combined.
Gradually add the whole milk, vanilla extract, and salt to the egg mixture, whisking until smooth.
Pour the custard mixture into the prepared pie crust.
Bake in the preheated oven for 45 minutes, or until the filling is set and lightly golden.
While the pie is baking, prepare the praline sauce. In a saucepan over medium heat, melt the butter.
Stir in the brown sugar and heavy cream, bringing the mixture to a gentle boil. Continue to stir until thickened, about 3-5 minutes.
Remove the saucepan from heat and add the pecans and vanilla extract, stirring to combine.
Allow the pie to cool for a few minutes after baking, then drizzle the warm praline sauce over the top.
Serve slices of the custard pie warm or at room temperature, garnished with extra praline sauce if desired.