Preheat your oven to 350°F (175°C). Line a 12-cup muffin tin with cupcake liners.
In a medium bowl, whisk together flour, baking powder, baking soda, and salt.
In another bowl, cream the butter and sugar together until light and fluffy.
Beat in the eggs one at a time, then stir in vanilla and sour cream.
Fold the dry ingredients into the wet mixture until just combined.
Gently fold in the chopped strawberries.
Spoon the batter into cupcake liners, filling each about 2/3 full.
Bake for 18–20 minutes, or until a toothpick inserted into the center comes out clean.
Let them cool in the pan for 5 minutes before transferring to a wire rack to cool completely.