With the delightful aroma of cinnamon and the satisfying balance of tender cake and crunchy streusel, this Original Bisquick Cinnamon Streusel Coffee Cake is a guaranteed crowd-pleaser.
Preheat oven to 375° (F). Grease an 8-inch square baking dish or a 9-inch pie pan. Your pie dish should be about 1½ to 2 inches deep.
In a large bowl, combine Bisquick baking mix, sugar, cinnamon, milk, and egg. Mix well.
Pour the mixture into the greased baking dish or pie pan.
In a separate bowl, combine Bisquick baking mix, brown sugar, cinnamon, and butter with a blender or fork. You'll know it's done once you get a crumbly mixture. This is the streusel topping for the coffee cake.
Spread the topping evenly over the cake batter.
Bake in the preheated oven for 22 minutes or until the center is firm when lightly pressed.
Allow cake to cool slightly and cut into squares to serve.