Cinnamon Bread

Preheat the oven to 350 degrees F (175 degrees C). Generously grease a 9x5-inch loaf pan.

To make the bread: Beat flour, sugar, buttermilk, eggs, oil, vanilla, baking powder, cinnamon, salt, and baking soda in a large mixing bowl until well combined, about 3 minutes. Pour batter into the prepared loaf pan; smooth the top.

To make the topping: Stir sugar, butter, and cinnamon together in a small bowl until crumbly; sprinkle over batter. Use a paring knife to swirl batter for a marbled effect.

Bake in the preheated oven until a toothpick inserted into the center comes out clean, about 50 minutes. Remove bread from the pan to a wire rack to cool completely.