Easy Coffee Cake Recipe with Sour Cream

Instructions:

1. Preheat oven to 350°F (175°C). Grease an 8x8 inch pan and line with parchment paper, leaving an overhang on the sides.
2. Prepare the cinnamon streusel by combining flour, brown sugar, and cinnamon in a small bowl. Rub in the cold cubed butter using a fork or fingers until pea-sized clumps form.
3. Create the cinnamon ribbon by mixing melted butter, brown sugar, and cinnamon into a thick paste in a separate small bowl.
4. In a large bowl, whisk together the cake batter dry ingredients: flour, granulated sugar, baking powder, and salt.
5. Stir in the softened butter, egg, sour cream, and vanilla extract. Mix until just combined to avoid over-developing gluten.
6. Spread half of the cake batter into the prepared pan. Spread the cinnamon ribbon paste over the center, leaving a small border.
7. Top with the remaining batter and sprinkle the cinnamon streusel evenly across the surface.
8. Bake for 30-35 minutes until a toothpick inserted in the center comes out clean and the top is deep golden brown.
9. Cool the cake in the pan for at least 20 minutes before lifting and slicing.