Begin by preheating your oven to 350°F (175°C). Grease a 9x5 inch loaf pan generously with butter or non-stick spray, and set it aside to prepare for the batter.
In a medium mixing bowl, combine the all-purpose flour, baking powder, and salt. Whisk together until the mixture is well blended, then set the bowl aside.
In a large mixing bowl, use an electric mixer to cream together the softened unsalted butter and granulated sugar. Beat the mixture for about 3-5 minutes until it becomes light, fluffy, and pale in color.
Add the large eggs to the butter and sugar mixture one at a time, ensuring to mix well after each addition. Then, pour in the pure vanilla extract and combine thoroughly.
Slowly add the flour mixture to the creamed butter, alternating with the buttermilk. Start and finish with the flour mixture. Mix gently until just combined, taking care not to overmix.
Carefully fold in the colorful Christmas-themed sprinkles, distributing them evenly throughout the batter without deflating the mixture.
Pour the batter into the prepared loaf pan and use a spatula to smooth the top for an even bake.
Place the loaf pan in the preheated oven and bake for 50-60 minutes. To check for doneness, insert a toothpick into the center of the bread; it should come out clean when it is ready.
Once baked, let the bread cool in the pan for 10 minutes. After that, transfer it to a wire rack to cool completely before glazing.
For the glaze, whisk together the powdered sugar and milk in a small bowl until it reaches a smooth and drizzle-worthy consistency. Once the bread has cooled, drizzle the glaze over the top for an added touch of sweetness.
Notes
Once sliced, arrange the bread on a festive platter. For an extra holiday flair, garnish with additional sprinkles and a light dusting of powdered sugar.