Preheat oven to 180°C or 350°F, and line a 12-cup muffin tray with paper muffin cups.
Mix the dry ingredients (except the walnuts and the cacao nibs or chocolate chips) in a large bowl, until combined.
Mix the wet ingredients in a food processor or blender, until well combined.
Add the wet mixture to the dry mixture and stir to combine.
Add the chopped walnuts and stir again to combine.
Spoon the mixture into the muffin tins.
Add the cacao nibs or chocolate chips on top.
Bake for 20-25 minutes, or until the muffins are golden and cooked through.
Enjoy with a dollop of almond butter, for added protein!