Move rack to upper third in oven and preheat oven to 350°. Line a 9x5 inch aluminum loaf pan with parchment paper. In a large mixing bowl, whisk together flour, sugar, baking powder, baking soda, and kosher salt. In a smaller bowl, whisk together egg, buttermilk, butter, and almond extract. Add wet ingredients to dry and mix just until combined. Fold in sprinkles.

Transfer batter to loaf pan and bake for 45-50 minutes or until center of bread is set. Let cool in pan for 5 minutes, then transfer bread to a wire rack to cool completely. The buttermilk bread is dense so it will take 1-2 hours to cool completely.

Once bread has cooled completely, prepare glaze. Whisk together powdered sugar, buttermilk, and corn syrup. Adjust buttermilk as needed to get a thick pourable consistency. Spoon over bread and top with nonpareils.