- Preheat oven to 375°F (190°C). Line a muffin tin with paper liners. 
- In a large bowl, mix flour, sugar, baking powder, and salt. 
- In another bowl, whisk together milk, oil, egg, and vanilla extract. 
- Pour wet ingredients into dry ingredients and stir until just combined. 
- Fold in chopped strawberries. 
- Divide batter evenly among muffin cups. 
- Bake for 20-25 minutes or until a toothpick inserted into the center comes out clean. 
- Let cool in the tin for 5 minutes, then transfer to a wire rack to cool completely.