Preheat oven to 400 degrees F (205 degrees C). Line a 12-cup muffin tin with paper liners.
In a large bowl, stir together milk, egg, and oil. Add flour, baking powder, sugar, and blueberries; gently mix the batter with only a few strokes. Spoon batter into cups.
Bake for 20 minutes. Serve hot.
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