1. Preheat Oven & Prepare the Muffin Tin

• Preheat oven to 375°F (190°C).
• Line a muffin tin with paper liners or lightly grease it.

2. Mix the Dry Ingredients

• In a large bowl, whisk together flour, sugar, salt, and baking powder.

3. Combine Wet Ingredients

• In a separate bowl, mix vegetable oil, egg, milk, and vanilla extract until smooth.

4. Mix the Batter

• Pour the wet ingredients into the dry ingredients and stir until just combined.
• Do not overmix to keep the muffins soft.

5. Fold in the Blueberries

• Gently fold in the blueberries.

6. Fill the Muffin Cups

• Divide the batter evenly among the muffin cups, filling each about ¾ full.

7. Make the Crumb Topping

• In a small bowl, combine sugar, flour, butter, and cinnamon.
• Use a fork or your fingers to mix until it forms coarse crumbs.

8. Add Topping & Bake

• Sprinkle the crumb topping generously over each muffin.
• Bake for 18-22 minutes, or until a toothpick inserted in the center comes out clean.

9. Cool & Serve

• Let the muffins cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.