01 -
Turn your oven to 350°F (175°C) and heat it up. Line a square 9×9-inch pan with parchment or grease and dust with flour.
02 -
In one medium bowl, combine the sugar, salt, flour, baking powder, and soda. In a larger bowl, beat the egg and softened butter until nice and airy. Stir in the coffee, buttermilk, and vanilla. Slowly mix the dry ingredients into the liquid mixture until smooth.
03 -
Spread the batter evenly in your pan and bake it for 25–30 minutes. Check with a toothpick to see if it's done—it should come out clean. Let it rest in the pan for at least 10 minutes, then move it to a cooling rack.
04 -
As that cake cools, make the caramel. Heat up the butter, sugar, and heavy cream together in a pot over medium. Stir while it bubbles for 3–4 minutes. Once it thickens a bit, take it off the heat and mix in the vanilla and salt. Set it aside.
05 -
Take a small bowl and whisk the brewed coffee with powdered sugar until it’s smooth and glossy.
06 -
Evenly pour and spread the warm caramel on top of the cooled cake. Drizzle the coffee topping over the caramel, making fun patterns.
07 -
Once the caramel seeps a bit into the cake, cut it into slices and share with everyone. You can serve it warm or leave it at room temp.