In a mixing bowl, add the active starter, warm water, whole milk, cocoa powder, molasses, honey, avocado oil, vanilla, and cinnamon and whisk until generally combined.
1 (225g) cup water, ⅓ (100g) cup whole milk, ½ (100g) cup active sourdough starter (100% hydration), 3 (45g) tablespoons unsulphured molasses, 3 (70g) tablespoons honey, 4½ (65g) tablespoons avocado oil, ½ teaspoon vanilla extract, 2 (13g) tablespoons unsweetened cocoa powder, ¼ teaspoon ground cinnamon