Stir the dry base: In a large bowl, mix rolled oats, cocoa powder, espresso powder, a pinch of salt, and chopped nuts if using. This helps distribute the flavors evenly.
Combine wet ingredients: In a separate bowl, stir together the nut butter, honey or maple syrup, vanilla, and peppermint extract. If your nut butter is stiff, warm it for 10–15 seconds to loosen.
Bring it together: Pour the wet mixture into the dry ingredients.
Stir with a sturdy spoon or use clean hands. If the mixture seems dry or crumbly, add milk 1 tablespoon at a time until it holds when pressed.
Fold in chocolate: Add mini chocolate chips and gently mix. If the dough is warm, chill for 5–10 minutes first so the chips don’t melt.
Roll into bites: Scoop about 1 tablespoon of mixture and roll into balls.
Aim for 18–22 bites depending on size.
Optional coating: Roll bites in crushed peppermint candies for a festive crunch or cacao nibs for extra cocoa oomph.
Chill to set: Place on a parchment-lined plate and refrigerate for at least 20–30 minutes. They firm up and become easier to store.