I did a quick search and here is one that seems simple.
Up until this past month I had never seen the brand you mentioned
here in New England. Is it from your area?
It seems to have caught my eye recently, and it doesn't seem familar.
Here is the recipe I found:
Mrs. William's Crumb Cake presented by And The Horse You Rode In On - Bed & Breakfast
1 cup firmly packed brown sugar
1 1/2 cups flour
1/3 cup butter or margarine
Cinnamon and sugar
1/2 teaspoon salt
1 tablespoon baking powder
1/2 cup milk
1 egg, beaten
Mix brown sugar, flour and butter together until it has a crumb like consistency. Take out 2/3 cup of the "crumbs" for topping.
To the balance of the "crumbs" add the salt and baking powder. Mix well. Add the milk and egg, mixing well. Pour into greased 8"x8" pan. Top with 2/3 cup of "crumbs". Sprinkle with cinnamon and sugar. Bake 35 minutes at 350 degrees.