Preheat your oven to 350 degrees Fahrenheit.
Place the ready-made refrigerated pie crust or homemade pie crust in a pan, ensuring it covers the bottom and sides evenly. Set it aside for now.
In a medium saucepan, melt the butter over low heat. Add the coarsely chopped unsweetened chocolate and stir until it is completely melted.
Remove the saucepan from the heat and stir in the sugar until it combines with the chocolate. Make sure there are no lumps and the mixture appears smooth.
Now, it's time to add the flour, eggs, vanilla extract, and a dash of salt to the chocolate mixture. Mix everything thoroughly until all the ingredients are well incorporated. You want a smooth, velvety batter.
Stir in the semi-sweet chocolate chips. These little morsels of goodness will bring an extra burst of chocolatey delight to every bite of the pie.
Pour the chocolate mixture into the prepared pie crust, spreading it evenly to fill the crust. You'll notice the luscious batter has a glossy sheen, indicating its perfect texture for baking.
Place the pie in the oven and let it bake for approximately 25 minutes. Keep an eye on it, as baking times may vary. The top should form a delicious crust, and the sides should feel firm. A slight jiggle in the center is acceptable since it will firm up as the pie cools.
Once the baking time is up, remove the Brownie Pie from the oven and set it aside to cool completely. The aroma wafting through your kitchen will make resisting hard, but patience is vital to achieving the ideal texture.
Once the pie has cooled, you can cut it into slices and serve it as is or with a dollop of whipped cream, a scoop of vanilla ice cream, or a drizzle of warm chocolate sauce. The possibilities are endless!