0.5cupunsalted butter, softened to room temperature
1cupsour cream
2largeeggs
1teaspoonvanilla extract
1teaspoonbaking powder
1teaspoonbaking soda
0.5teaspoonsalt
0.5cupall-purpose flour (for streusel)
0.33cupbrown sugar, packed firmly
1tablespoonground cinnamon
0.25cupunsalted butter, melted
0.5cupchopped pecans or walnuts (optional)
Instructions
Preheat your oven to 350°F (175°C) and generously grease a 9x13-inch baking pan to prevent the cake from sticking.
In a large mixing bowl, combine the softened butter and granulated sugar. Using a hand mixer or standing mixer, cream the mixture together until it becomes light and fluffy, which should take about 3-4 minutes.
Add the eggs to the mixture, one at a time, ensuring each egg is fully incorporated before adding the next.
Next, blend in the sour cream and vanilla extract until everything is uniformly mixed together.
In a separate bowl, whisk together the flour, baking powder, baking soda, and salt. Gradually fold the dry mix into the wet mixture, stirring gently until just combined.
For the streusel topping, in another bowl, mix together the flour, brown sugar, ground cinnamon, and melted butter until crumbly. If using, fold in the chopped nuts.
Pour half of the batter into the prepared baking pan, smoothing the surface with a spatula. Sprinkle half of the streusel topping over the batter.
Pour the remaining cake batter over the first streusel layer, followed by the rest of the streusel topping.
Bake in the preheated oven for 30-35 minutes, or until a toothpick inserted in the center comes out clean.
Once baked, allow the coffee cake to cool in the pan for about 10 minutes. Then, gently remove it from the pan and transfer it to a wire rack to cool completely.
Notes
Serve warm or at room temperature. Dust with powdered sugar for an extra touch.