Line an 8-inch round cake pan with parchment paper and grease the edges.
In a mixing bowl, combine sugar, vegetable oil, eggs, and vanilla extract. Beat until smooth.
Mix in the sour cream until well blended.
Sift together flour, cocoa powder, baking powder, baking soda, and salt in a separate bowl.
Gradually add dry ingredients to wet ingredients, alternating with hot coffee until just combined.
Pour the batter into the prepared cake pan and spread evenly.
Bake for 28-30 minutes or until a toothpick inserted comes out clean. Let cool completely.
Soften the ice cream for about 15-20 minutes, then crumble the cooled cake into a mixing bowl and combine with the ice cream.
Transfer the mixture back into the springform pan and freeze for 2-4 hours until firm.
For the topping, beat chilled heavy whipping cream until soft peaks form. Gradually add powdered sugar, cocoa powder, and vanilla, beating until stiff peaks form.
Frost the cake with the whipped cream mixture and refreeze for 30-60 minutes before serving.
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Notes
Store leftovers in an airtight container in the freezer for up to 2-3 months.