Crumb Coffee Cake

• 1/2 cup buttermilk
• 1 1/4 cup flour
• 1 cup firmly-packed brown sugar
• 1/4 teaspoon salt
• 4 tablespoons butter
• 1/2 teaspoon baking powder
• 1/4 teaspoon baking soda
• 1/2 teaspoon ground cinnamon
• 1 egg lightly beaten

1. Preheat oven to 375°F. 
   
   
2. If you do not have buttermilk, make your own by mixing 1/2 cup milk with 1/2 teaspoons vinegar and let set until needed.
   
   
3. In mixing bowl, combine the flour, sugar and salt.  
   
   
4. Cut in the butter with a pastry blender or fork until the mixture resembles a course meal.  Reserve 1/2 cup of the mixture for the topping.
   
   
5. Stir the baking powder, baking soda, and cinnamon into the remaining mixture.
   
   
6. In a small bowl, beat the egg and buttermilk together and then add to the mixture.  Stir just until the dry ingredients are moistened.
   
   
7. Poor the batter into a greased 8x8x2 baking pan and spread evenly.
   
   
8. Scatter the reserved topping over the batter.
   
   
9. Bake 30 to 35 minutes or until an inserted toothpick comes out clean.