Preheat your oven to 350°F (175°C) and prepare a 9x5-inch loaf pan by greasing it or lining it with parchment paper.

In a medium bowl, whisk together 1¾ cups of all-purpose flour, 1 teaspoon of baking powder, ½ teaspoon of baking soda, and ½ teaspoon of salt.

In a large bowl, whisk together ½ cup of melted unsalted butter and 1 cup of granulated sugar until smooth. Add 2 large eggs one at a time, followed by 1 cup of buttermilk and 2 teaspoons of vanilla extract.

Gradually mix the dry ingredient mixture into the wet ingredients until just combined, avoiding overmixing.

Fold in ½ cup of red and green sprinkles carefully to avoid overmixing.

Pour the batter into your prepared loaf pan, smoothing the top. If desired, sprinkle 1 tablespoon of coarse sugar and a few extra sprinkles on top.

Bake in the preheated oven for 45–55 minutes, checking for doneness around the 40-minute mark.

Allow the bread to cool in the pan for 10-15 minutes before transferring to a wire rack to cool completely.