The word streusel is a german word, meaning "something scattered or sprinkled" and refers to a crumb topping of butter, flour and sugar that is baked on top of muffins,cakes or breads.In todays modern days, spices and nuts are added to the original streusel topping, and also is used in rich pastries or baked inside the cakes. Any way you decide to use it is definitely a delicious addition.
In this particular cake the combination of apples and sour cream in the batter balances well with the sweetness and richness of the streusel topping.
3 cups all-purpose flour
1 cup granulated sugar
4 tsp baking powder
1/2 tsp salt
2 large eggs
1 cup sour cream
1/2 cup milk
8 tbsp unsalted butter melted and slightly cooled ( 1 stick)
2 apples peeled, cored and chopped recommended Granny Smith ( about 2 cups)
1 cup brown sugar firmly packed.
1/2 cup all purpose flour
6 tbsp cold unsalted butter cut in 1/2 inch pieces
1 cup chopped walnuts.
1 tsp cinnamon
Preheat the oven to 400˚F. Butter an 13 x 9 x 2 inch baking pan and set aside.
In a large bowl whisk together the flour, granulated sugar, baking powder and salt. Set aside.
In a different mixing bowl, whisk together the eggs just until the egg yolks is combined with the egg whites. Add the sour cream, milk and melted butter. Mix well.
To make the topping.
In a medium bowl mix together all the ingredients for the topping except the butter. Mix until well combined. Using a pastry blender or 2 knives cut in the butter until the mixture resembles coarse crumbs.
Peel and cut the apple. Add the egg mixture to the flour and mix until just moistened. Add the cut apple. Mix well.
Pour the batter into the prepared baking pan. Sprinkle the topping over the batter.
Bake in the preheated oven for 30 minutes or until the tester comes out clean when inserted in the middle.
Let cool in the pan on the rack for 10 minutes. Cut and serve warm or at room temperature.
Serve with a cup of coffee or your favorite tea.