1
Heat the oven to 200°C. Grease 8 cups of a muffin tray or line them with paper liners. 2
Whisk the flour, sugar, baking powder, and salt in a large bowl.
3
In another bowl, stir the vegetable oil, egg and milk until well combined.
4
Stir the wet mixture into the flour mixture until just combined. Gently fold in the blueberries and set the batter aside.
5
For the crumb topping, mix the sugar, flour, butter, and cinnamon in a small bowl with a fork until crumbly.
6
Fill the muffin cups to the top with batter and add the crumb topping.
7
Bake for 20 to 25 minutes, until a toothpick inserted into the center of a muffin comes out clean.