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

In a medium mixing bowl, whisk together the all-purpose flour, baking powder, baking soda, and salt until evenly combined.

In a large mixing bowl, melt the unsalted butter and whisk in the granulated sugar until smooth. Add the eggs one at a time, then incorporate the buttermilk and vanilla extract.

Gradually add the dry ingredients to the wet mixture, stirring gently until just combined.

Fold in the red and green sprinkles, being careful not to overmix.

Pour the batter into the prepared loaf pan and bake for 45–55 minutes or until a toothpick comes out clean.

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