Preheat your oven to 350°F (175°C) and line a 12-cup muffin tin with cupcake liners.
In a medium bowl, whisk together flour, baking powder, baking soda, and salt.
In a large mixing bowl, beat the softened butter and sugar until light and fluffy.
Add in the eggs, one at a time, then mix in the sour cream, milk, and vanilla extract.
Slowly stir the dry ingredients into the wet until just combined. Do not overmix.
Gently fold in the chopped strawberries.
Scoop the batter into the prepared cupcake liners, filling each about 2/3 full.
Bake for 18–22 minutes or until a toothpick inserted into the center comes out clean.
Cool in the pan for 5 minutes, then transfer to a wire rack to cool completely before frosting.