Preheat oven to 350 ℉.
Mix Cinnamon and Sugar in a bowl and set aside.
Prepare a loaf pan with baking spray, or butter or vegetable oil and coated and flour.
Cream together the butter, sugar, and eggs. Once it’s combined, add the buttermilk, flour, and baking soda. Mix together until just combined. Try not to over-mix the batter.
Add ½ the batter to a loaf pan and then add ½ the cinnamon and sugar mixture.
Add remaining batter to the pan and sprinkle the rest of the sugar on top.
Using a knife or skewer, swirl together the batter and cinnamon sugar mixture.
Bake for 45-50 minutes in preheated oven.
The bread will be done when you can poke it with a toothpick and it comes out clean.
Let cool in pan for at least 30 minutes.
Gently remove from pan, running a knife along the edges of the pan and bread if stuck.
Slice and enjoy!