Ingredients

The following ingredients have 4 Servings
  • 1 cup dark brown sugar
  • 1/2 cup sugar
  • 1 1/2 tbs cinnamon
  • 1/2 tsp salt
  • 1 cup unsalted butter (melted and warm)
  • 2 1/2 cups flour
  • 2 1/2 cups flour
  • 1 tsp baking soda
  • 3/4 tsp baking powder
  • 1/2 tsp salt
  • 3/4 cup unsalted butter (at room temperature)
  • 1 1/2 cups sugar
  • 2 eggs
  • 1 1/3 cups sour cream
  • 1 tsp vanilla

Instruction

  • For the crumbs: mix the sugars, cinnamon and salt in a medium bowl. Add the warm melted butter and stir to blend. Add the flour and mix until crumbs begin to form (it will clump). Set aside.
  • For the cake: Preheat oven to 350F/180C and grease a 9 x 13-inch glass baking dish.
  • Sift together the flour, baking soda, baking powder and salt in a medium bowl; set aside.
  • Beat the butter in the bowl of a stand mixer--the batter is dense so it will require a sturdy mixer--until smooth. Add the sugar and beat until it's light and fluffy.
  • Add the eggs, beating well after each addition. Scrape down the sides and bottom of the bowl.
  • Add the sour cream and vanilla and mix until just incorporated. Don't overmix!
  • Add the flour in 3 additions, beating until just incorporated. Again, do not overmix.
  • Pour batter into prepared pan and spread evenly in the pan.
  • Squeeze small handfuls of the crumbs together to form small clumps. Drop the clumps evenly over the batter, covering the top completely. The crumb layer will be thick.
  • Bake for 50-60 minutes or until a toothpick inserted in the center comes out clean. Avoid overbaking.
  • Cool at least 30 minutes on a rack before serving.