"I wouldn’t want to live in a world without coffee...or cake!..."
Cooking spray, for the pans
all-purpose flour, plus more for the pans
granulated sugar
baking powder
baking soda
kosher salt
sticks salted butter
instant coffee granules
boiling water
buttermilk
large eggs
vanilla extract
sticks salted butter, at room temperature
1-pound box powdered sugar
kosher salt
instant coffee granules
heavy cream, plus more if needed
chocolate-covered toffee bars
(such as Heath)