Preheat your oven to 350°F (175°C). This ensures the cake bakes evenly.
Grease your cake pans with butter or cooking spray and lightly flour them.
Mash the ripe bananas until smooth. Set aside.
In a large mixing bowl, combine the unsalted butter, sugar, and brown sugar. Cream them together until light and fluffy, about 3-5 minutes.
Add the eggs, one at a time, beating well after each addition. Mix in the vanilla extract.
Gently fold in the Greek yogurt and the mashed bananas until well combined.
In a separate bowl, whisk together the all-purpose flour, baking powder, baking soda, cinnamon, and salt.
Gradually add the dry ingredients to the wet mixture, stirring gently until just combined.
Gently fold in the semi-sweet chocolate chips.
Divide the batter evenly between the prepared pans. Bake for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
Once baked, let the cakes cool in the pans for about 10 minutes, then transfer to a cooling rack.
For a decadent finish, heat the heavy cream until just simmering. Pour it over the remaining chocolate chips in a bowl, stir until smooth, then pour over the cooled cake.