Take a small bowl and add sugar, flour, butter, and cinnamon. Use a fork to mix it together, lightly breaking the butter into the mixture, the mixture will have a coarse texture. This will be your strusel topping.
Preheat oven to 350 F.
Take a large bowl and add the flour, sugar, salt, and baking powder. Mix it all well. In another bowl mix the oil, vanilla, egg, and milk. Now mix it well with the flour mixture
Gently fold in your blueberries.
Fill muffin papers 3/4 of the way full. Add topping to the top of each one and gently touch so it stays on the top.
Bake for 20-23 minutes. Check at 20 and every few minutes after, remove when the top springs back when gently touched in the center. Or put a toothpick in the center and when it comes out clean, remove promptly.