These chewy Espresso Chocolate Chip Blondies are full of coffee flavor and studded with melty spots of dark chocolate. Enjoy them with a cold glass of milk or double up the caffeine with a cup of coffee.
Preheat the oven to 350°F (180°C). Grease an 8x8-inch (20 cm) baking pan and line with parchment paper, leaving a few inches of overhang.
In a medium bowl, whisk together the flour, espresso powder, baking powder, and salt.
In a large bowl, whisk together the warm melted butter with the light brown sugar until well combined. Add the egg, egg yolk, and vanilla extract and whisk until smooth.
Fold in the flour mixture until just combined then fold in the chopped chocolate. Don't overmix.
Transfer the batter evenly into the prepared baking pan, smoothing out the top (use the back of a spoon for easier spreading). Bake for 20-25 minutes until the top is shiny and wrinkled and the edges are golden brown.
Cool for at least 45 minutes in the pan then lift out the blondies and slice into squares.
Notes
Vanilla Extract: Yes, we use 1 whole tablespoon in this recipe. It seems like a lot, but it works really well with the rest of the flavors.
Storage: Place them in an airtight container at room temperature for up to 5 days.
These blondies taste better the next day since their flavor has had time to develop. If you like them gooey, just pop them in the microwave for a few seconds.