01 -
Turn your oven on to 190°C and cover your baking sheets with parchment paper.
02 -
Mix flour, salt, and baking soda well in a medium bowl.
03 -
With a mixer, beat the softened butter along with both sugars until the mix is fluffy and light, about 2 or 3 minutes.
04 -
Add eggs one by one, then mix in vanilla until everything blends nicely.
05 -
Stir together cocoa with milk and espresso powder if you’re using it, until it’s smooth and ready.
06 -
Slowly fold dry mix into the buttery blend just until mixed. Then fold in chocolate bits and gently swirl in the cocoa paste.
07 -
Gently fold in the mini marshmallows carefully so they stay whole and spread out evenly.
08 -
Drop dough by spoonfuls on sheets with some space between each. Bake 9 to 11 minutes until edges firm up but centers stay soft.
09 -
Let cookies sit on the sheets for 5 minutes then put them on a wire rack to cool completely.