01 -
Set your oven to 375°F and pop some paper liners into your muffin pan.
02 -
Grab a big bowl and toss in the flour, sugar, sifted cocoa powder, espresso powder, baking soda, baking powder, and salt. Mix them up.
03 -
In a smaller bowl, stir together the melted butter, buttermilk, eggs, and vanilla. Pour it into your dry mix and stir until it comes together. Add the chocolate chips, but don't stir for too long.
04 -
Fill up your muffin cups evenly with the batter.
05 -
In another small bowl, mix the flour, sugar, and toffee bits. Use a fork to mash the butter into the mix until it turns crumbly. Sprinkle a little over each muffin before baking.
06 -
Pop the muffins in for about 20 minutes. Check with a toothpick—if it comes out clean, they’re done. Let the pan cool on a wire rack for 5 minutes, then take the muffins out to cool completely.