Preheat the oven to 350°F and line a baking sheet with parchment. This prevents regretful sticking.
Whisk flour, oats, cocoa powder, espresso powder, baking soda, and salt in a bowl. No lumps, no problems.
Beat melted butter, brown sugar, and granulated sugar until smooth. If you taste-test, we won’t judge.
Mix in the egg and vanilla extract until fully incorporated. The dough should already smell amazing.
Slowly combine the dry mixture with the wet ingredients. Stir just until blended—overmixing ruins lives.
Fold in chocolate chunks. This is where things get exciting.
Scoop tablespoon-sized portions onto the baking sheet, spacing them 2 inches apart. No cookie collisions.
Bake for 12 minutes, or until the edges are set and the centers remain soft. Trust the process.
Cool on the baking sheet for 5 minutes, then transfer to a rack. Or eat immediately—no judgment.
Pair with coffee, milk, or straight from your hands.