Preheat the oven to 350°F (177 C). Line an 8-by-8-inch (20-by-20-cm) baking pan with parchment paper.
Combine the black beans, dates, jam, and vanilla in a food processor.
Blend until smooth.
Add the flour, cocoa powder, and salt and blend again.
Pour into the prepared pan and smooth the top with moist hands. If desired, sprinkle evenly with chocolate chips or spread with the raspberry jam.
Bake for 30 minutes. Remove from the oven and cool completely. Use the parchment paper to lift the brownies out of the pan. Cut into 16 squares. Refrigerate for up to 1 week, stored in a covered container.
