Mix dry ingredients. Beat the eggs and add to dry mixture along with oil, applesauce, and vanilla. Mix thoroughly. Add apple and nuts and stir to combine.
If using whole flax seeds; you’ll need a decent blender for this one:
Blend eggs, oil, flax seeds, applesauce and vanilla about a minute, or as long as it takes to grind up the seeds completely. (This just about killed my blender, so I decided “good enough” when my blender just didn’t want to move anymore.) The mixture will get very gummy and thick quite quickly.
Combine dry ingredients separately.
If you have a high-powered blender, add dry ingredients to the mixture in the blender and blend to combine, then stir in apples and walnuts.
If you have a regular blender, pour wet mixture from blender into a bowl, where you can combine with dry ingredients, apples and nuts.
To finish either method:
Allow fully incorporated mixture to stand 10 minutes.
Preheat oven to 350 degrees F. Line or grease muffin tins. Spoon into tins (the batter will be very thick) and bake for 18 minutes or until a toothpick inserted in the center comes out clean. (12-14 for mini muffins)