Line a square 9x9 inch baking pan with parchment paper and preheat the oven to 350°F/180°C.
In a medium sized bowl, whisk together melted butter, brown sugar, and coffee until smooth.
3/4 cups butter, 1 1/2 cups light brown sugar, 2 tbsp freshly brewed coffee
Add in egg and vanilla and continue whisking until paler in colour (about 2 minutes). This is important to mix well for that crackly top.
1 egg, 1 tbsp vanilla
Toss in the baking soda, flour, and salt and fold just until no dry flour streaks appear.
1 1/2 cups all-purpose flour, 1/2 tsp salt, 1/2 tsp baking soda
Add in pecans and chocolate chunks and mix.
3/4 cups pecans, 3/4 cups dark chocolate
Using a spatula, spread the batter evenly into the prepared pan. Bake for 24-30 minutes, depending on your oven. The blondies are ready the edges are a golden brown and just beginning to form cracks. A wooden skewer inserted into the blondies should come out with just a couple of crumbs. If it is wet, keep baking.
Slightly open the oven door for 10 minutes and allow the hot air to come out. Then completely remove the blondies from the oven and cool on the counter.
Let the pan cool completely on a wire cooling rack before cutting, then enjoy!