Preheat your oven to 350°F (175°C) and prepare the loaf pan.

Whisk together flour, baking powder, baking soda, and salt in a medium bowl.

In a large bowl, mix melted butter and sugar until creamy, then add eggs one at a time, followed by vanilla and buttermilk.

Gradually combine the dry ingredients with the wet mixture, stirring gently until just combined.

Fold in the red and green sprinkles with a spatula.

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

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