Country Cinnamon Swirl Buttermilk Loaf
from https://www.tasteofhome.com/

1/4 cup butter, softened
1 cup sugar
1 large egg, room temperature
2 cups all-purpose flour
1 teaspoon baking powder
1/2 teaspoon baking soda
1/2 teaspoon salt
1 cup buttermilk

Cinnamon Swirl Mix:
1 tablespoon ground cinnamon
1/3 cups sugar

In a large bowl, beat the butter, 1 cup sugar and egg until blended.

Combine the flour, baking powder, baking soda and salt; add to egg mixture alternately with buttermilk.

In a small bowl, combine the cinnamon and remaining sugar.

Pour a third of the batter into a greased 8x4-in. loaf pan; sprinkle with a third of the cinnamon sugar. Repeat layers twice. Cut through batter with a knife to swirl the cinnamon around.

Bake at 350° for 45-50 minutes or until a toothpick inserted in the center comes out clean. Cool for 10 minutes before removing from pan to a wire rack to cool completely.