Recipes from my grandmother’s recipe card collection: buttermilk pie (NOT Southern Buttermilk Pie)

I am back y'all! I was burnt out from holiday baking but my workplace celebrates Pi Day (we are science nerds) so I tried a Buttermilk Pie from my grandmother's recipe collection. I was truly surprised by the end result, I wouldn't say it's a pie at all! It was delicious though. This recipe was from a family friend, Fran Jones, and is NOTHING like the custard-y Southern Buttermilk Pie I saw when I googled other recipes. There are no eggs, no mention of a pie crust, and cinnamon instead of nutmeg. The recipe was very easy, and made the house smell like cinnamon rolls. I did put the filling into a pie crust, but it really didn't need to be in one. The end result was more of a cinnamon coffee cake, and while delicious, is not what I'd call a pie. It was very tasty, not too sweet, and the cake was moist and had a very light crumb. I'd definitely make it again as a coffee cake. See the recipe card in the last photo or see below if you'd like to try making this "pie".

Buttermilk Pie
from Fran Jones

Crumbs:
1 cup sugar
2 cups flour
1 tsp. salt
½ cup oleo, butter or shortening (I used Crisco)

Add crumb ingredients to a bowl, cut in the shortening with a fork or pastry cutter. Reserve 1 cup of crumbs for top

Add to rest of crumb mixture:
1 cup buttermilk
1 tsp. vanilla
1 tsp. cinnamon
1 tsp. baking soda

Put in greased pie pan; add crumbs to top.
Bake at 350°- 25 minutes (it took me 40 minutes)