Preheat your oven to 350°F (175°C) and grease a 9-inch round cake pan.
In a large bowl, cream together the sugar and softened butter until light and fluffy.
Add eggs one at a time, mixing well after each addition.
Stir in the vanilla extract and brewed coffee until well combined.
In another bowl, whisk together flour, baking powder, and salt.
Gradually add the dry ingredients to the wet mixture, stirring until just combined.
For the streusel topping, mix brown sugar, flour, and melted butter until crumbly.
Pour half of the batter into the prepared pan and sprinkle half of the streusel on top.
Add the remaining batter and top with the rest of the streusel.
Bake in the preheated oven for 35-40 minutes or until a toothpick comes out clean.