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.