Moist and Fluffy Sour Cream Coffee Cake

Ingredients:

For the Cake:

1/2 cup unsalted butter, softened

1 cup granulated sugar

2 large eggs

1 cup sour cream

1 teaspoon vanilla extract

1 1/2 cups all-purpose flour

1 teaspoon baking powder

1/2 teaspoon baking soda

1/4 teaspoon salt

For the Streusel Topping:

1/2 cup packed brown sugar

1/2 cup all-purpose flour

1/4 cup unsalted butter, cold and cut into small pieces

1 teaspoon ground cinnamon