Over the years I've made this cake with milk soured with vinegar, buttermilk, kefir and even sour cream. Despite what Mom's recipe says, I never make it with margarine anymore, although that was all the rage back in the misguided heyday of my youth. This was my Dad's (my children's beloved Petje) favourite cake.
Combine the dry ingredients for the cake in a bowl and set aside. Cream the sugar and butter. Add the beaten eggs and half of the dry ingredients, then half of the milk. Mix well, then stir in the rest of the dry ingredients followed by the remaining milk, taking care not to overbeat.
Place half of the batter in the prepared pan, spreading it evenly. Sprinkle on half of the topping mix. Then add the rest of the batter and sprinkle on the rest of the topping.
Bake at 350℉ for about an hour, or until a cake tester comes out clean. Depending on your oven, I suggest checking for doneness at 50 to 55 minutes.
Cinnamon Loaf Coffee Cake https://urbancottagelife.com/cinnamon-loaf-coffee-cake/