Preheat the oven to 350 degrees F and prep a 8x8-inch baking pan with parchment paper.
In a large bowl, combine melted butter, eggs, vanilla extract, and coffee then mix together well.
Add the white and brown sugars to the mixture and whisk together well.
Sift cocoa powder, flour, and salt into the bowl and mix until just combined
Toss in chocolate chips (or chunks) and fold into the batter.
Add batter to pan and smooth to the edges. You can add more chocolate chips to the top before baking if desired.
Bake for about 30 minutes or until the center is just set. You'll notice the center does not wiggle when the pan is moved.
Measure and prepare all your ingredients before starting to make the recipe even easier.
Make sure to line your baking pan otherwise your brownies will stick to the pan, this is a super important tip!
Make sure to sift your ingredients to avoid lumps where possible, cocoa powder can be quite lumpy.
If you don't have an 8x8 inch pan for your brownies just use foil to create one or two walls for a smaller baking dish. Line with parchment and you'll be good to go!
The batter is thick so spread it out to the corners of the baking pan as best you can but it'll level out in the oven.
The coffee really helps to enhance the chocolate flavor, the brownies themselves don't have a strong coffee flavor but you can skip it if you want.
You can add either chopped chocolate or chocolate chips to the top of your brownies but this is totally optional. I've made the recipe both ways but found the brownies to be a bit more photogenic without the additional chocolate on top.
Don't over-bake your brownies. Unlike cake layers, brownies will not have a springy center and a skewer inserted into the center will not come out clean. Your brownies are done when the center is set and you see the top just begin to crack.
The center will continue to bake and set after you remove the brownies from the oven so don't worry if they seem a bit fudgy.
Measure your flour correctly! Adding too much flour to your brownies will take away from that nice fudge-like texture. The best and easiest way to measure flour is by using a scale. If you don't have one then fluff your flour with a spoon, sprinkle it into your measuring cup, and use a knife to level it off.
Storage and freezing - leftover brownies will keep well in the fridge for 4 days or can be frozen. Thaw completely before serving.