In a medium bowl mix ¼ cup of flour, sugar, cinnamon. Next add in butter - I use clean hand and mix together the mixture till it becomes coarse crumbles - set aside.
In a large bowl add - flour, sugar, baking powder and salt. Next add in butter - I use clean hand and mix together the mixture till it becomes coarse crumbles. In small bowl add milk, egg and vanilla together. Then pour the wet mix into the dry. You will have a VERY thick batter.
Spread batter into pan ( again it will be VERY thick) top with crumble topping.
Cook for 25 - 30 minutes.
Enjoy
Recipe by Budget Savvy Diva at https://www.budgetsavvydiva.com/2012/07/coffee-cake-recipe/