- Preheat the oven to 350°F (175°C) and grease an 8×8 inch baking pan.
- In a large bowl, mix together the sweet potato puree, sourdough discard, cocoa powder, maple syrup, melted coconut oil, vanilla extract, salt, and baking powder until well combined.
- If using, fold in the chocolate chips.
- Pour the batter into the prepared baking pan and spread it evenly.
- Bake for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
- Allow to cool before cutting into squares and serving.
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