Preheat the oven to 400 degrees.
Combine flour, sugar, baking powder, and salt. Add the milk, egg, and oil; mix well, but do NOT over mix the batter. Fold in the blueberries. Fill muffin tins right to the top.
Combine all ingredients and cut the butter until pea sized. Sprinkle the topping over each individual muffin. Bake for 20-25 minutes or until a toothpick inserted in the center comes out clean.
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