preheat oven to 350℉.
pour box mix into a medium sized bowl.
add instant espresso powder and salt.
add oil, water, and eggs to bowl and mix!
fold in chocolate chips.
pour batter evenly across 12 muffin liners. they should be pretty much full.
follow the muffin tin baking instructions on the back of the box. for me, it usually takes 16m.
allow to cool completely.
fill the center with cooled ganache with any method. i've used a piping bag (easiest and least messy), a ketchup squeeze bottle (second best), and the good ol' spoon-it-in method.