Fold in melted chocolate and stir until just combined.
1/4 cup milk chocolate chips, melted smooth
Pour batter into a prepared loaf pan and bake for 20-22 minutes, rotating halfway through. Brownies will puff up slightly as they bake, but the top will fall when they are done.
Allow brownies to cool in the pan for 15-30 minutes. Lift out of the pan, slice, and serve.
Store brownies in an airtight container for 3-4 days or freeze.