Preheat oven to 375 degrees and grease an 8-inch round cake pan. Place a piece of parchment paper on the bottom of the pan and spray it with nonstick cooking spray. Set aside.
To make the cake, put 1 cup of the chocolate chips and the unsalted butter in a microwave safe bowl and heat until the butter is melted and the chocolate chips are soft, about 1 minute.
Stir until the chocolate is melted and the mixture is smooth.
Add sugar, salt and vanilla to mixture, stirring to combine.
Add the eggs and stir until smooth. Next, add the cocoa and stir until just combined. Be careful not to over mix.
Pour the batter into the prepared pan and bake for 25 minutes or until cake has a thin crust on top.
Let the cake cool on a cooling rack for 10 minutes. Loosen the edges of the pan with a knife and carefully turn it upside down onto a serving plate. Let the cake cool completely.
While cake is cooling, make the chocolate ganache by combining the remaining cup of chocolate chips and cream in a medium microwave-safe bowl and heat until the cream is very hot so it will melt the chocolate (heat in 30 second intervals to avoid burning).
Remove bowl from microwave and stir until the chocolate melts and mixture is smooth.
Spread chocolate ganache evenly over the cooled cake and let glaze set for a few hours before serving.