Pre- heat oven to 350° (175°) and grease and flour a 9" (23 centimeter) cake pan.
In a large bowl whisk together the flour, sugar, salt and baking powder. Add the cubed cold butter and mix until the mixture becomes coarse crumbs.
Remove 3/4 cup of the crumbly mixture and place in a small bowl, stir in the cinnamon, this will be your streusel topping, set aside.
In a medium bowl add the milk, eggs, and vanilla, beat with a fork until combined. Add the wet mixture to the flour mixture. Stir with a wooden spoon or spatula just until moistened, stir for 15-16 stirs (no more). Gently fold in the chocolate chips.
Spoon the batter into the prepared cake pan and sprinkle with the topping. Bake for approximately 45-55 minutes check for doneness with a toothpick. Let cool before serving. Enjoy.