Preheat oven to 375 degrees F (190 degrees C). Grease or line muffin pan.
In a large bowl, mix together the flour, white and brown sugars, salt, and baking powder. Stir in oil, eggs, and milk until well blended and very few lumps remain. Gently fold in blueberries being careful not to mash them.
Fill muffin tins 2/3 full, or slightly more for a larger muffin top.
For the crumb topping, mix together the flour, softened butter, cinnamon, and brown sugar. Place a small amount on top of each muffin.
Bake muffins in the preheated oven for 20 to 30 minutes, or until a wooden skewer pierced in the center comes out clean and dry.
Cool for 10 minutes before removing from pan to a wire rack. Combine the confectioners’ sugar and lemon juice until smooth; drizzle over warm cake.
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