Preheat oven to 350°F and line a baking sheet with parchment paper.
Dissolve the espresso powder in hot water and set aside.
In a large bowl, combine flour, cocoa powder, baking soda, and salt.
In another bowl, mix sugar, coconut oil, almond milk, vanilla, and espresso mixture.
Slowly add wet ingredients to dry ingredients, stirring until combined.
Stir in walnuts and chocolate chips.
Scoop dough into tablespoon-sized balls and place them on the prepared baking sheet.
Bake for 12–15 minutes until edges are set.
Let cookies cool on a wire rack before devouring.