Start by preheating your oven to 350°F (175°C). In a mixing bowl, blend together granulated sugar, cocoa powder, melted butter, beaten eggs, and vanilla extract until the mixture is smooth and well combined.
Pour the batter into the prepared chocolate pie crust, spreading it evenly. Then, bake in the preheated oven for about 30-35 minutes. You'll know it's done when the edges look set and the center is slightly soft.
Once baked, let the pie cool on a wire rack. After it has cooled, sprinkle chocolate chips on top and allow them to melt slightly. Optionally, you can add a dollop of whipped cream before serving for an extra touch.
Notes
Feel free to customize toppings with nuts or extra whipped cream for added texture and flavor!