My mom used to make this on holidays. She used nutmeg, but I prefer the mellower flavor of mace, which is made by grinding the dried lacy covering of the nutmeg seed. 

COWBOY COFFEE CAKE
 
Mix together in a large bowl:

2 cups packed brown sugar
2/3 cups butter, softened 
2 1/2 cups flour
1/2 teaspoon salt
1 teaspoon cinnamon
1 teaspoon mace (or nutmeg)

Reserve 1/2 cup of mixture to sprinkle. To remaining mixture add:
2 teaspoons baking powder
1/2 teaspoon baking soda
Mix until distributed evenly. 
 
In a separate cup mix together :
1 cup milk 
1 tablespoon of vinegar

In a bowl whisk:
2 eggs and then whisk in the milk/vinegar mix.

Pour liquid mixture over dry mixture and stir to combine. 
Pour into prepared 15 x 8 x 2 inch glass baking pan.
Sprinkle the reserved mixture to create a crumb surface on top.
Bake at 375 degrees for 25 to 30 minutes.