This is from the food blog, “One Perfect Bite” and is gorgeous!

3 tbsp unsalted butter
4 cups diced peeled cored Granny Smith apples (about 4 large)
3 tbsp sugar
1 tsp ground cinnamon

1-1/2 cups all-purpose flour
1 cup firmly packed golden brown sugar
1/2 cup (1 stick) unsalted butter, cut into pieces, room temperature
1/2 tsp salt
1/3 cup toasted chopped walnuts
3/4 cup canned pure pumpkin
1/3 cup sour cream
2 tbsp sugar
2 tsp pumpkin pie spice
1 tsp baking soda
2 large eggs

Prepare the apples; Melt butter in a large nonstick skillet over medium-high heat. Add apples; saute until apples begin to brown, about 5 minutes.
Add sugar and cinnamon and saute until golden brown, about 3 minutes longer. Cool.

Prepare cake;  Preheat the oven to 350 F. Butter a 9 inch diameter springform pan. Combine flour, brown sugar, butter and salt in a large bowl. Using the electric mixer beat until the mixture resembles coarse meal. Place walnuts in a small bowl. Add 2/3 cup of crumb mixture to nuts and set aside.
Beat pumpkin, sour cream, 2 tbsp sugar, spice and baking soda into remaining flour mixture, beating just until smooth.
Beat in the eggs. Transfer the batter to the pan. Scatter the apples evenly over the top.
Sprinkle reserved topping over the apples.

Bake the cake;  Transfer pan to the oven and bake until the topping is golden brown and tester inserted into center comes out clean, about 1 hour 10 minutes.
Cool cake in pan on rack for about 20 minutes. Run a knife around the pan sides to loosen cake. Release the pan sides from the cake. Transfer the cake to a platter.
(Can be made 6 hours ahead. Let stand at room temperature)
Serve warm or at room temperature with ice cream.

Serves 6 – 8