SWEET POTATO AND BLACK BEAN BROWNIES

Name: Sweet Potato and Black Bean Brownies
Ingredients: 9 oz. (250g) sweet potato; 1 14oz. (400g) can black beans, drained; 1⁄2 cup (60g) walnuts; 3.5 oz. (100g) coconut sugar; 1 bar dark chocolate, chopped; 3 tablespoons olive oil