Ingredients
Method
- 1. Preheat the oven to 350°F (175°C). Grease or line an 8x8-inch baking pan with parchment paper.
- 2. Cream the butter and sugar until light and fluffy. Add eggs one at a time, then mix in vanilla and sour cream.
- 3. In a separate bowl, whisk together flour, baking powder, baking soda, salt, and cinnamon.
- 4. Gradually add the dry mixture to the wet ingredients, mixing until just combined.
- 5. Prepare the streusel by combining brown sugar, granulated sugar, flour, and cinnamon, then cut in the cold butter until crumbly.
- 6. Pour half the batter into the pan, sprinkle with half the streusel, then top with the remaining batter and streusel.
- 7. Bake for 35–45 minutes, or until a toothpick inserted in the center comes out clean.
- 8. Let cool for 10 minutes before slicing. Serve warm or at room temperature.
Notes
For extra moisture, use full-fat sour cream or Greek yogurt. Add a drizzle of glaze or a sprinkle of powdered sugar for a bakery-style finish. Store in an airtight container for up to 3 days.
