Apple Cake with Streusel topping

Ingredients:
For the Cake:
All purpose Flour - 3 cups
Granulated sugar -1 cup
Sour cream - 1 cup
milk - 1 cup
Baking Powder - 4 tsp
Unsalted Butter- 1 stick (Melt the butter and allow it to cool)
Eggs - 3
Granny Smith Apples -2
Salt - 1 tsp

For the Topping:
Brown Sugar - 1cup
All purpose flour - 1/2 cup
Unsalted Butter - 3/4 stick (Cold and cut into 1/2 inch peices)
Chopped Walnuts - 1 cup
Cinnamon - 1 tsp

Pre heat the oven to 400 F.

1.In a bowl add all purpose flour,granulated sugar, baking powder and salt and mix together. Keep it a side.

2.Take another bowl and add the eggs and whisk until the white and yellow mix. Add the sour cream, melted butter and milk and mix well.

3.In another bowl mix well all the ingredients for topping except the butter.Using 2 knives cut in the butter.The mixture should resemble coarse crumbs.

4.Peel and cut the apples. Add the egg mixture to the flour kept aside at first and mix until the flour gets moistened.Then add the apples and mix well.
5. Apply butter in the baking pan and dust all purpose flour over it and tap and remove the excess flour.
6.Pour in the batter and over it sprinkle the coarse crumbs.

Bake until the cake is done.