Add the "wet" mixture to the "dry mixture" once it is well combined fold in the blueberries and pour batter into the greased pan - note the batter will be thick
Topping - combine all the ingredients in a small bowl - then spread on top of the batter
Bake for about 45 minutes
Enjoy!
Recipe by Budget Savvy Diva at https://www.budgetsavvydiva.com/2013/07/blueberry-coffee-cake-recipe/