Ingredients
Method
Preparation
- Preheat your oven to 350°F (175°C). Grease and flour a 9x13-inch baking pan.
- In a large bowl, cream butter and sugars until light and fluffy.
- Add eggs one at a time, mixing well after each addition. Stir in vanilla.
- In a separate bowl, whisk together flour, baking powder, baking soda, and salt.
- Alternate adding the flour mixture and buttermilk to the butter mixture, beginning and ending with flour.
- Pour half the batter into the prepared pan, sprinkle with half the cinnamon sugar topping, then add remaining batter and top with the rest of the topping.
- Swirl gently with a knife for a marbled effect.
- Bake for 35–40 minutes, or until a toothpick inserted in the center comes out clean.
- Let cool slightly before slicing into squares and serving.
Notes
For a gluten-free version, substitute with a gluten-free all-purpose blend. You can also add nuts or fruits for extra texture.