Ingredients:
2 cups all-purpose flour
1 cup granulated sugar
1/2 cup unsalted butter, at room temperature
2 teaspoons baking powder
1/2 teaspoon baking soda
1/2 teaspoon salt
1 cup sour cream
2 large eggs
1 teaspoon vanilla extract
For the streusel topping:
1/2 cup all-purpose flour
1/2 cup brown sugar
1/2 teaspoon cinnamon
1/4 cup unsalted butter, at room temperature
