Preparation: Preheat oven to 350°F (175°C). Blind bake pie crust if needed.
Make Filling: Heat cream and milk, dissolve coffee and sugar. Whisk eggs and vanilla, then gradually add warm milk mixture.
Bake: Bake for 30-35 minutes until set but slightly jiggly in the center.
Cool and Chill: Cool at room temperature, then chill in the refrigerator for at least 4 hours.
Serve: Sprinkle sea salt flakes on top before slicing and serving. Enjoy your Salted Coffee Custard Pie!