- Take butter and eggs out, and let it warm to room temperature. 
-  Preheat oven to 350 degrees. 
- Combine the dry ingredients (Flour, Almond flour, baking powder, baking soda, cinnamon, lemon zest and salt. Measure them out to a mixing bowl. Then stir to combine. Set aside. 
- In a large mixing bowl, add sugar. Then add butter, vanilla, and apple cider vinegar. Beat together until light and fluffy.  
- Add two eggs and mix to combine. Then slowly add milk and yogurt.  
- Add dry ingredients and stir to combine. 
- Gently fold in blueberries. 
- Optional - sprinkle topping over muffin batter before placing in the oven. 
- Pour the batter into paper lined muffin pan cups. 
- Bake for 25-30 minutes until slightly golden brown on top.  
- Remove from oven and cool for 5-10 minutes before serving.Enjoy!