Black Bean Brownies Recipe

1 (15.5 ounce) can black beans, rinsed and drained
3 tablespoons vegetable oil
¼ cup cocoa powder
2 teaspoon vanilla extract
¾ cup white sugar
3 eggs
1 pinch salt
½ cup chopped walnuts (optional)
1 teaspoon instant coffee (Optional)
½ cup milk chocolate chips (Optional)
Dusting of powdered sugar (optional)
Bake at 350 Fahrenheit for 20-25 minutes in an 8x8 baking pan.