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Preheat the oven to 350F. Spray bread pans with non-stick spray or line with tinfoil.
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In the bowl of a stand mixer with a paddle attachment, beat together the butter and 2 cups sugar until light and fluffy.
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Add the eggs and vanilla extract. Combine until mixed well, scraping down the sides as needed.
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Add the flour, buttermilk, and baking soda slowly as the mixer spins so as not to spread flour everywhere.
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Pour 1/4 of the batter into 2 bread pans.
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Mix the 1/3 cup of sugar with the 2 teaspoons of cinnamon.
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Sprinkle 1/4 of the mixture on top of the batter in the bread pans.
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Divide the remaining batter between the two bread pans and top with remaining cinnamon-sugar mixture.
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Use a toothpick or knife to create swirls on the top.
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Bake for 50-60 minutes, or until a toothpick comes out clean when inserted into the center.
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Allow the bread to rest on a cooling sheet in the bread pans for about 20 minutes.
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Rmove the bread from the pan and allow to cool fully.