Preheat oven to 350 degrees. Brush standard muffin tins with butter; dust with flour, tapping out excess. Sift together cake flour, baking powder, salt, and spices three times.
With an electric mixer on medium-high speed, cream butter and brown sugar until pale and fluffy. Add eggs, one at a time, beating until each is incorporated, scraping down sides of bowl as needed. Reduce speed to low. Add flour mixture in two batches, alternating with two additions of milk, and beating until combined after each.
Divide batter evenly among prepared cups, filling each three-quarters full. Bake, rotating tins halfway through, until golden brown and a cake tester inserted in centers comes out clean, about 20 minutes. Transfer tins to wire racks to cool completely before removing cupcakes.
To finish, place cupcakes on a wire rack set over a baking sheet; spoon glaze over cupcakes, and let set. Cupcakes are best eaten the same day they are glazed; keep at room temperature until ready to serve.
Don't skip the crucial step of sifting the dry ingredients three times, as it helps to fully distribute the spices for the best flavor.