Preheat your oven to 375°F (190°C) and line a muffin tin with paper liners.
In a large bowl, cream the butter and sugar together until light and fluffy.
Add the eggs one at a time, beating well after each addition. Stir in the vanilla extract.
In a separate bowl, whisk together the flour, baking powder, and salt.
Gradually add the dry ingredients to the wet ingredients, alternating with the milk, mixing gently until just combined.
Fold in the diced strawberries.
Divide the batter evenly among the prepared muffin cups.
Bake for 20-25 minutes, or until a toothpick inserted into the center of a muffin comes out clean.
Allow the muffins to cool in the pan for 5 minutes, then transfer to a wire rack to cool completely.