Mary's Cinnamon Coffee Cake

This coffee cake uses a clever single-mixture technique. Mix flour, both sugars, butter, and a full tablespoon of cinnamon into crumbs, reserve ¾ cup for the topping, then add the wet ingredients to the rest. The crumb base does double duty as both the cake batter and the streusel.

Buttermilk is what makes this cake tender and moist. Its acidity reacts with the baking soda to give the batter a good lift, and the tang balances the sweetness of two cups of sugar (one white, one brown). The brown sugar adds a caramel depth that white sugar alone can’t provide.

The directions are emphatic about one thing: DO NOT overmix. Once you add the buttermilk, eggs, baking soda, salt, and vanilla to the crumb mixture, stir just enough to wet everything. Lumps are fine. Overmixing develops gluten and turns a tender coffee cake into a tough, bready disappointment.

Pro Tips

• Reserve the crumb topping before adding the wet ingredients. Once the buttermilk goes in, you can’t go back.
• Grease and flour the tube pan thoroughly, especially the center tube. Coffee cake sticks aggressively.
• Cool completely in the pan before removing. This cake is fragile when warm and breaks apart easily.
• Test with a wooden pick at 45 minutes. The center of a tube pan bakes slower than the edges.

Variations

• Nut streusel: Add ½ cup chopped pecans or walnuts to the reserved crumb topping for extra crunch.
• Apple cinnamon: Layer thin apple slices in the middle of the batter before adding the topping.
• Cream cheese drizzle: Mix softened cream cheese with powdered sugar and milk, then drizzle over the cooled cake.