Using a fork, dock the bottom of your pie crust several times.
Blind bake the crust. Line the frozen pie crust with parchment paper and fill with pie weights. You can also use dry beans for the pie weights; using pie weights prevents the pie crust from puffing up. Bake for 10 minutes. Remove the parchment paper and weights and bake for an additional 3 to 5 minutes.
Allow the pie crust to cool for a few minutes and reduce the heat of your oven to 350F.
In a bowl, whisk together melted butter, sugar, eggs, milk, cornmeal, flour, lemon juice or white vinegar, vanilla extract, and a pinch of salt. Whisk until well-combined.
Carefully pour the filling into the pie crust. Bake until the edges and the center of the pie completely set. Bake time will be roughly 50 minutes. After 10-15 minutes of baking, shield the edges of pie crust with aluminum foil to prevent excessive browning.
Allow the pie to completely cool before slicing. Top with powdered sugar if desired.
Notes
Remember to blind bake the crust. To blind bake, line the frozen pie crust with parchment paper and fill with pie weights. You can also use dry beans for the pie weights; using pie weights prevents the pie crust from puffing up.
After 10-15 minutes of baking, wrap the crust (edges) of the pie with aluminum foil. This will prohibit the pie crust from becoming too brown.
You can use vinegar or lemon juice in the recipe; that said, do not use both.