Step 1: Preheat the oven to 350°F (175°C).
Step 2: Melt the chocolate and butter in a medium saucepan over low heat, stirring frequently.
Step 3: In a separate bowl, whisk together the flour, baking soda, and salt.
Step 4: Beat the eggs and sugar in another bowl until light and fluffy, then stir in vanilla.
Step 5: Combine the melted chocolate mixture with the egg mixture, then fold in dry ingredients and chocolate chips.
Step 6: Pour the batter into a greased 9-inch pie dish and spread evenly.
Step 7: Bake for 25-30 minutes until edges are set but center is slightly soft.
Step 8: Prepare the chocolate sauce by melting evaporated milk, sugar, butter, and chocolate chips.
Step 9: Serve the brownie pie warm with vanilla ice cream and drizzle with chocolate sauce.