
Make the streusel by combining flour, brown sugar, cinnamon, and cold butter, pinching with your fingers until crumbly, then refrigerate.
Whisk together flour, sugar, baking powder, and salt in a large bowl.
In a separate bowl, combine milk, oil, egg, and vanilla, then pour into the dry ingredients and fold until just combined before gently folding in the blueberries.
Divide batter among 6 silicone muffin cups, filling each about three-quarters full, and sprinkle streusel on top.
Air fry at 330°F for 12-14 minutes until tops are golden and a toothpick comes out clean.
Cool in the molds for 5 minutes before removing.
Tip: Toss the blueberries in a teaspoon of flour before folding them into the batter — this prevents them from sinking to the bottom during cooking. Frozen blueberries work well too, just don't thaw them first.
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