Preheat the Oven:
Set it to 350°F (175°C). Grease and line two 8-inch cake pans.
Prepare the Dry Ingredients:
Whisk flour, baking soda, and salt in a bowl.
Mix the Wet Ingredients:
Cream butter and sugar until fluffy. Add eggs, mashed bananas, coffee, and vanilla. Mix well.
Combine and Bake:
Gradually fold in the dry ingredients. Divide the batter evenly between the pans.
Bake the Cake Layers:
Bake for 30–35 minutes. Let them cool completely before frosting.
Make the Frosting:
Beat butter until smooth. Add powdered sugar, dissolved coffee, vanilla, and heavy cream. Beat until fluffy.
Assemble the Cake:
Spread frosting on one cake layer, stack the second layer, and frost the top and sides.
Serve and Enjoy:
Slice and enjoy with extra coffee.