This cardamom coffee cake is a perfect breakfast or brunch treat. The cake is made with all-purpose flour, baking powder, salt, ground cardamom, unsalted butter, granulated sugar, eggs, vanilla extract, and milk. The streusel topping is made with brown sugar, ground cinnamon, ground cardamom, and chopped nuts. The cake is moist and tender, with a crunchy and sweet topping that adds a delicious texture to every bite. You can serve this cake with a cup of coffee or tea for a cozy and comforting morning treat.