Ingredients
Method
- Preheat your oven to 350°F (175°C). Grease a 9x9 inch pan or line it with parchment paper.
- Make the crumb topping: Mix all the topping ingredients together using a fork or your hands until you get coarse crumbs. Place in the fridge while you work on the cake.
- Prepare the cinnamon filling: Stir the brown sugar and cinnamon in a small bowl and set aside.
- Mix the cake batter: Cream butter and sugar together until fluffy. Beat in eggs one at a time. Add vanilla. Mix in sour cream.
- Add dry ingredients: In a separate bowl, whisk together flour, baking powder, baking soda, and salt. Slowly mix the dry into the wet until just combined.
- Layer the batter: Spread half the batter into the pan. Sprinkle the cinnamon filling over it. Add the remaining batter on top. Smooth gently.
- Top it off: Sprinkle the crumb topping over everything.
- Bake: About 40–45 minutes, or until a toothpick comes out clean from the center.
- Cool and serve: Let it cool at least 15 minutes before slicing.
Notes
Use full-fat sour cream for best texture. Don’t overmix the batter—mix until just combined. This cake tastes even better the next day and also freezes well for up to 2 months.