Preheat oven to 375°F (190°C). Line 24 standard muffin cups with paper liners.
Whisk together the flour, baking powder, and salt. Set aside.
Using an electric mixer on medium-high speed, beat the butter, sugar, and brown sugar until pale and fluffy. Add the eggs, one at a time, mixing well after each addition. Mix in the vanilla.
Reduce mixer speed to low. Add the flour in two batches, alternating with the milk. Stir in the chocolate chunks.
Divide the batter evenly among the muffin cups, using about 1/4 cup batter in each cup. Bake for 20 minutes, or until the cupcakes are pale golden and a pick inserted into the center comes out clean.
Cool the cupcakes in the pans for 10 minutes. Then, transfer the cupcakes to wire racks to finish cooling.