Preheat your oven to 375°F (190°C) and line a muffin tin with paper liners.
In a mixing bowl, combine the flour, sugar, baking powder, and salt.
In another bowl, whisk together the egg, milk, vegetable oil, and vanilla extract.
Pour the wet ingredients into the dry ingredients, stirring until just combined.
Gently fold in the chopped strawberries.
Spoon the batter into the prepared muffin tin, filling each cup about two-thirds full.
Bake for 18-20 minutes or until a toothpick inserted into the center comes out clean.
Allow the muffins to cool in the tin for 5 minutes before transferring them to a wire rack.
Enjoy them warm or at room temperature.