Preheat the oven to 350 degrees F and lightly oil or spray a muffin pan (or line with muffin liners).

Add all of the ingredients for the muffins (except for the walnuts) to a high-powered blender and blend until completely smooth. Note: the batter will be thick - this is normal. Stir in 1/2 cup of raw walnuts. Pour the batter into the prepared muffin tray, filling 9 of the holes 3/4 of the way up.

Stir together the ingredients for the walnut topping. Spoon the topping over the muffin batter.

Bake on the center rack of the preheated oven for 20 to 25 minutes, or until the edges begin to turn golden-brown. Turn off the oven and leave muffins in the warm oven for 5 minutes.

Remove muffins from oven and allow them to cool at least 30 minutes before releasing them from the muffin tray. Note: if you don't use muffin liners, run a knife between each muffin and the muffin tray in order to pop them out. Serve and enjoy!