01 -
Use a mixer to whip together the butter, sugar, and eggs until the mixture is smooth and fluffy. Slowly add the buttermilk, flour, and baking soda, stirring just enough to combine.
02 -
Pour a little less than half the batter evenly into two greased loaf tins. In a separate bowl, mix the sugar and cinnamon for the topping. Sprinkle most of this cinnamon sugar over the batter in the pans.
03 -
Spread the remaining batter across both pans, covering the cinnamon layer. Use the leftover cinnamon sugar to sprinkle on top. Gently swirl everything with a knife to create a marbled look.
04 -
Place the loaf pans into a preheated oven at 350°F (175°C) and bake for 45–50 minutes, or until a toothpick poked in the middle comes out clean. Let the loaves cool off in their pans for about 20 minutes. Then carefully take them out.