Preheat your oven to 350 degrees
In a large bowl, whisk 1/2 cup of hot water with 1/2 cup of dark chocolate cocoa powder until smooth
Add 3/4 cup of olive oil and 2 teaspoons of vanilla extract and whisk to combine
Add 1 cup of granulated sugar and 3 large eggs and whisk vigorously until creamy and fully combined
Add 1 1/4 cups of all purpose flour, 1/2 teaspoon of baking soda, 1/2 teaspoon of salt and 2 teaspoons of espresso powder and whisk until just combined
Prepare a 9 inch springform pan by greasing the interior and lining the bottom with parchment paper
Transfer the cake batter into the prepared pan
Bake the cake for 30-35 minutes on the center rack of a 350 degree oven
When a toothpick will come from the center of the cake clean, transfer the cake pan to a heat proof surface and let the cake cool for 5 minutes before transferring the cake directly onto a cooling rack
Lightly sprinkle the warm cake with some flaky sea salt
Serve with whipped cream
Store leftovers in an airtight container at room temperature