Sour Cream Coffee Cake
In a small bowl mix together the ground cinnamon and sugar for the cinnamon swirl.
Make the Cinnamon Swirl topping
In a medium bowl whisk together the flour, brown sugar, and cinnamon until fully combined.
Make the Crumb topping
Pour in the melted butter and mix it all together, you want a wet sand texture, thick clumps are good.
Add melted butter
Set the streusel topping aside while you prepare the cake.
Let topping sit
In a medium bowl whisk together the flour, baking soda, baking powder, and salt.
Preparing cake mixture
Beat the oil, sugar, and butter on medium speed together for 2-3 minutes, scrape down the bowl after the first minute then continue mixing.
Mix sugar and butter
Add the eggs, one at a time, scraping down the bowl after each addition. Add the vanilla in with the lasg egg.
Gently fold in ⅓ the dry ingredients until just almost combined. Then gently fold in ½ of the sour cream until just combined. Then repeat
Fold dry ingredients then sour cream
Pour ½ of the batter into the pan then sprinkle all of the cinnamon swirl mixture on top. Scoop spoonfuls of the remaining batter on top & spread into an even layer. Sprinkle all of the crumble on top into an even layer. Bake for 40-50 minutes
Layer cake together then bake