Preheat oven to 350°. Grease a 12-count muffin pan with avocado oil or line with cupcake liners.
In a food processor, pulse dates until roughly chopped. Add maple syrup and 2 of the apples that have been shredded - and mix until blended. Add eggs, avocado oil and vanilla until well blended.
In a large bowl, stir both flours, cinnamon, nutmeg, baking powder and salt. Add date and apple batter and, using a spatula, mix until all ingredients are well incorporated.
Spoon the batter evenly into each cup or liner, filling each about 3/4 of the way.
Top with sliced apples (a mandolin comes in handy here) and chopped walnuts.
Bake for 20-25 minutes until toothpick inserted into the center comes out clean. Allow the muffins to cool for 10 minutes before removing them from muffin tins. Enjoy!