Preheat your oven to 350°F (175°C) and grease a loaf pan thoroughly to prevent sticking.
In a large mixing bowl, combine the dry ingredients: flour, sugar, baking powder, baking soda, cinnamon, and salt. Stir well to ensure even distribution.
In a separate bowl, whisk together the wet ingredients: eggs, buttermilk, melted butter, and vanilla extract. Whisk until fully blended and smooth.
Gradually pour the wet ingredients into the dry ingredients, mixing gently until just combined. Be careful not to overmix, as this can affect the bread’s texture.
Pour the batter into the prepared loaf pan, spreading it evenly and smoothing the top with a spatula.
In a small bowl, mix together the topping ingredients (sugar and cinnamon). Sprinkle this mixture evenly over the batter for a sweet, cinnamon-infused crust.
Bake the bread for 50-60 minutes, or until a toothpick inserted into the center comes out clean.
Once baked, let the bread cool in the pan for 10 minutes, then transfer it to a wire rack to cool completely before slicing.
Notes
Don’t Overmix the Batter: Stir the wet and dry ingredients until just combined. Overmixing can lead to a dense bread instead of a light and tender texture.
Swirl the Cinnamon Sugar for Flavor and Visual Appeal: The swirl not only enhances the flavor distribution but also gives the bread its beautiful marbled look, so don’t skip this step!
Add the Donut Coating After Cooling: Let the bread cool completely before brushing with butter and adding the cinnamon-sugar topping to ensure it adheres properly and maintains its crunch.
