Get out and measure your ingredients.
In a large mixing bowl, combine the sugar, eggs, vanilla, milk and melted butter until well mixed.
Add the flour, baking powder and cinnamon and mix with a spatula or wooden spoon only until combined.
Add the blueberries and gently fold to disperse in the batter.
Prepare baking pan with cooking spray. Fill the silicone baking cups about ⅔ full with batter.
Prepare sugars, flour and butter in a small bowl. Use a fork and mix until crumbs. Place on top of each muffin.
Place the filled baking cups in the air fryer basket.
Cook on the air fry setting at 320F for 12-14 minutes, or until the blueberry muffins are fully cooked and a toothpick inserted in the center comes out clean
Allow the muffins to cool slightly before serving. Enjoy every bite!