Preheat oven to 350º F. Line a muffin tray with paper muffin cups.
In a large bowl, whisk together the flour, sugar, baking soda, cinnamon, and salt; set aside.
In another bowl, whisk together the eggs, olive oil, applesauce, and vanilla extract. Once cohesive, gently stir in the raisins and the grated apple. (As noted in the ingredients, make sure you peel the apple. Otherwise you'll end up with bits of tough skin broken up into your muffins and it won't do favors for the texture.)
Gradually add the dry ingredients to the wet ingredients, stirring constantly, until everything is well combined.
Spoon the mixture into the paper cups right up to the tops of the cups. Sprinkle the tops with ground flaxseed meal and chia seeds for an extra punch of nutrition (optional).
Bake for 25 minutes, or until a cake tester/toothpick comes out clean.