Preheat oven to 375 degrees Fahrenheit. Line a muffin pan with paper liners or grease lightly.
In a large bowl, mix flour, sugar, baking powder, baking soda, and salt.
In another bowl, whisk oil, eggs, milk, and vanilla extract until smooth.
Pour wet ingredients into dry ingredients. Mix gently until just combined. Do not overmix.
Fold in chopped strawberries carefully so they are evenly spread.
Divide batter into muffin cups, filling each about three quarters full.
Bake for 18 to 22 minutes or until a toothpick inserted in the center comes out clean.
Let muffins cool in the pan for 5 minutes, then move to a rack to cool completely.