Preheat oven to 350 degrees F (176 C)
烤箱提前预热175°C左右

You’ll need to rinse, drain, and puree a can of black beans to make a good pasty base, then mix in the rest of your wet ingredients.
此食谱视频里是买的罐头装的熟的黑豆，所以需要冲洗、沥干后捣碎成泥状基底，然后混合其余的湿成分。
我们可以提前煮好黑豆，差不多需要200g~250g干黑豆

In a separate bowl, mix together the dry ingredients. I like to throw finely ground or instant coffee in with the dries. They add a little something something.
另取一碗，将干性材料混合在一起。咖啡粉可加可不加

Mix the wets and dries separately to make sure everything gets mixed evenly.
You can use one bowl, just be extra sure the baking powder is well mixed.
If you’ve ever experienced a mouthful of baking powder due to uneven mixing, well, you’ll make sure things are mixed real well next time.
你也可以直接用一个大盆，不提前混合好干性材料，依次加入这些配料，只要确保泡打粉这些干性和湿性材料混合均匀即可

Grease an 8×8 or 9×9 inch pan, then line with parchment paper.
准备个8/9英寸（20~23cm）烤盘, 刷上油，铺好油纸

Pour in batter and bake for 30 to 40 minutes, or until the edges are visibly cooked and the center doesn’t jiggle much when you shake the pan (a toothpick may still come out a little gooey, that’s fine!)*
Allow brownies to cool before cutting.
倒入面糊，175度左右，烘烤30~40分钟，注意观察状态，
四周熟透，晃动烤盘中间不会抖动，牙签插一下有点粘稠没关系！冷却后再切成块，这个随自己喜欢啦！

I have this *condition* where I serve secretly healthy foods to unsuspecting eaters then ask them to guess the secret ingredient. And with this recipe, almost no one guesses the brownies are filled with beans!