Line a 12-cup muffin pan with muffin liners. Preheat the oven to 350 °F (175 °C).
In a medium bowl, mix together the dry ingredients (flour through salt).
In a separate medium bowl, whisk the eggs a little or prepare the flax eggs (mix 2 tablespoons ground chia seeds with 6 tablespoons water and let sit for a minute until goopy like an egg). Add the olive oil and sugar and mix. Then add the applesauce and vanilla extract.
Add the dry mix to the wet mix and stir just until combined. Stir in the add-ins.
Mix together the sugar and cinnamon in a small bowl and sprinkle 1/2 teaspoon of cinnamon sugar over each muffin.
Bake for 16-20 minutes or until a toothpick inserted in the middle of a muffin comes out clean.
Let the muffins cool in the pan for 10 minutes, and then turn it out onto a rack and let cool completely.
Store in an airtight container for up to 3 days at room temperature or refrigerate for up to 1 week.