Preheat oven to 375 degrees. Place chocolate and butter in a 4 cup Pyrex measure or microwave-safe bowl. Place in microwave and heat on high, for 1 minute, stir, and heat for 30 seconds more. Let sit for a minute or so and stir until chocolate dissolves completely.
Add sugar, flour, eggs, vanilla, and salt. Stir until well combined.
Pour into lightly oiled 9 inch pie pan.
Bake for 25 minutes. Let cool for as long as you can wait. If you can't wait, vanilla ice cream helps cool a slice of pie on your plate.