Mix the sugar, baking soda, baking powder, salt, and flour in a large bowl.
Melt the butter and mix with the milk, eggs, and vanilla.
Gradually mix the dry ingredients into the wet mixture until a smooth batter forms.
Once batter forms, fold in 1 1/2 cups of the blueberries.
Scoop batter into jumbo muffin liners, and fill 2/3 of the line.
Top the batter with a few loose berries from the remaining berries. Press into the batter slightly.
Sprinkle batter with a pinch of decorating sugar.
Place muffins in the air fryer basket and cook at 375°F for 8 minutes, then reduce heat to 250° for 17 minutes. Make sure muffins are fully cooked using a toothpick pierced in the center of the muffin. If the toothpick has uncooked batter when removed, continue to cook 1 minute at a time until fully cooked.
Let muffins cool on a rack before removing them from liners.