In a large mixing bowl, add the flour, sugar, and baking powder.
Then mix in the eggs, vanilla extract, melted butter, and milk.
Fold in the blueberries. Then spoon your batter, filling about 2/3 way through, into a greased muffin tin or a muffin tin with a liner.
For the topping, simply add the brown sugar, sugar, flour, and butter. Mix until crumbly.
Sprinkle the topping on top of the muffin. Then place in the air fryer at 320 degrees F, for 12-14 minutes.
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