Preheat the oven to 350°F and line 14 cupcake tins with liners. If using a jumbo pan, you’ll make 6 to 8 cupcakes.
Sift or whisk together the flour, baking powder, baking soda, and salt. Set aside.
In a mixer with a paddle attachment, beat the butter at medium speed for about 1 minute until creamy.
Add the brown and granulated sugars, beating for another 1 to 2 minutes until fluffy. Scrape the sides of the bowl as needed.
Add the eggs one at a time, mixing each until combined before adding the next.
Stir in the vanilla extract.
Mix in half of the milk.
Add half of the flour mixture and mix to combine.
Stir in the remaining milk.
Add the rest of the flour mixture, mixing just until combined. Finish mixing with a spatula to avoid over-mixing.