In a large bowl, whisk together butter, salt, brown sugar, granulated sugar, molasses, and vanilla until combined. Add mashed banana and whisk again. Add eggs and whisk until incorporated, then buttermilk. Sprinkle baking soda and baking powder on the batter and whisk until combined and then (don’t skip this), 10 to 20 more times, ensuring that it very well dispersed in the bowl. Add flour and mix only until it disappears. Divide batter between 12 cups.
Bake 14 to 16 minutes, until a toothpick inserted into the cakes, comes out batter free.
Toffee Sauce: Combine butter, 1/2 cup of the heavy cream, and sugar in a larger saucepan than you think you’ll need over medium-high heat and bring to a simmer. Simmer, whisking frequently, for 5 to 7 minutes — the mixture thickens slightly. Add a couple of pinches of salt and vanilla.
Whipped Cream: In a medium-large clean bowl, beat remaining 1/2 cup heavy cream with an electric or you-powered whisk until it forms soft peaks. Don’t add sugar to this; I promise it does not need it.
To Serve: Remove one warm cake from the muffin tin and either plate it dome side-up or you can cut the dome off the cake with a serrated knife and serve the cake upside-down, as shown. (You can use the cake tops to pacify hangry people in your kitchen.) Ladle the cake generously with the toffee sauce, finish with a big dollop of the cream and a few flakes of sea salt. Repeat with remaining cakes.
Recipe Ever So Slightly Adapted from Smitten Kitchen
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