Apple Coffee Cake With Crumble Topping

1/2 cup unsalted butter
1 cup packed light brown sugar
2 large eggs
2 cups all-purpose flour
1 teaspoon baking soda
1 teaspoon ground cinnamon
1/2 teaspoon salt
1 cup plain yogurt or sour cream
1 teaspoon pure vanilla extract
3 cups peeled cored and chopped apples (Ida Red will work well here for a tart apple)

Crumble Topping:

3/4 cup packed light brown sugar
3/4 cup all-purpose flour
3/4 teaspoon ground cinnamon
6 tablespoons unsalted butter, softened

Preheat the oven to 350 degrees F. Lightly grease a 13 by 9-inch glass baking dish.
In a large bowl, cream together the butter and sugar until light and fluffy. Add the eggs 1 at a time, beating after the addition of each. In a separate bowl or on a piece of wax paper, sift together the flour, baking soda, cinnamon, and salt. Add to the wet ingredients, alternating with the sour cream and vanilla. Fold in the apples. Pour into the prepared baking dish, spreading out to the edges.

To make the topping, in a bowl, combine the sugar, flour and cinnamon. Cut in the butter until it resembles coarse crumbs. Sprinkle the topping over the cake and bake until golden brown and set, 35 to 40 minutes. Remove from the oven and let cool on a wire rack for at least 10 minutes.

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