Preheat oven to 350F degrees, position oven rack on the lowest level. Line a 9-inch pie plate with 1 refrigerated pie crust. Set aside.
In the bowl of a stand mixer fitted with the paddle attachment (or in a bowl using an electric mixer), cream ½ cup (1 stick) unsalted butter, melted and cooled slightly, 1 cup granulated sugar, ¼ teaspoon salt and 1 teaspoon vanilla extract on medium speed for about a minute. Scrape down the bowl and paddle.
In a separate small bowl, lightly beat 2 large eggs then add eggs to the mixer bowl, mix on medium speed until incorporated, about 30 seconds.
Add ½ cup all-purpose flour, mix on low until incorporated and no streaks of flour remain, about 20-30 seconds. Scrape down the bowl, mix on low for an additional 10 seconds.
Add in 1 cup semi-sweet chocolate chips and ½ cup chopped walnuts, mix on low until just combined, 10-15 seconds.
Pour mixture into prepared pie plate, smooth into an even layer.
Then bake until pie is set and a deep golden brown, about 40-45 minutes. Tent with foil the final 5 minutes of baking to prevent over browning, if necessary.
Transfer pie to a rack to cool for 2 hours. Serve at room temperature. Top with whipped cream or a scoop of ice cream.
Notes
Please refer to my FAQ’s (Frequently Asked Questions) and ingredient list above for other substitutions or for the answers to the most common questions.