This chocolate chip coffee cake recipe is perfect for chocolate lovers. The cake is moist and tender, with pockets of melted chocolate chips throughout. The streusel topping is made with brown sugar, cinnamon, and chopped walnuts, adding a delicious crunch to every bite. To make the cake, you'll need flour, sugar, baking powder, salt, butter, eggs, milk, vanilla extract, and chocolate chips. Mix the dry ingredients for the cake, then add the wet ingredients and mix until smooth. Fold in the chocolate chips, then pour the batter into a greased baking dish. Mix the streusel ingredients and sprinkle over the top. Bake for 35-40 minutes, or until a toothpick inserted in the center comes out clean. Serve warm with a glass of cold milk.