- Grease the slow cooker with butter or cooking spray. 
- In a large bowl, whisk together the flours, baking powder, baking soda, cinnamon, nutmeg, and salt. 
- In a separate bowl, whisk together the ground flaxseed, applesauce, dark brown sugar, melted butter, eggs, and vanilla extract. 
- Add the wet ingredients to the dry ingredients and mix with a wooden spoon until just combined. 
- Fold in the diced apples. 
- Pour the batter into the greased slow cooker and spread it out evenly. 
- Cover and cook on high for 2.5 hours or until a toothpick inserted into the center comes out clean. 
- Let the bread cool for 10 minutes before serving.