That Icelandic Apple Pie I'm trying to figure out

Best so far:

For the crust:
2 cups flour (260 g)
1 teaspoon salt
1 cup unsalted butter (2 sticks), cut into small cubes
1/2 cup full-fat sour cream

Whisk together flour and salt. Using hands, work the butter into the flour mixture. Add sour cream and work in with a fork. Once it starts to clump, knead with hands until the dough comes together. Divide in two, form disks, wrap in plastic wrap and chill for at least an hour. You will only need one disk for this recipe.

For the filling:

1 20 ounce can Kroger apple pie filling

1/2 of a 3.4 ounce box of Vanilla Instant Pudding & Pie Filling (49 g)

Stir until combined.

For the crumble:

1 cup flour

1/4 cup packed brown sugar

2 Tablespoons sugar

1/4 teaspoon cinnamon

1/4 teaspoon salt

8 Tablespoons unsalted butter, cubed, room temperature

Stir together dry ingredients. Add butter, toss to coat, then work into the mixture with hands until pea-size (or smaller) crumbs form throughout the mixture. You will not need all of the mixture.

1 10.4 ounce jar of King's Cupboard Cream Caramel Sauce 

Melt in microwave in 15 second increments until smooth. You will not need all of the sauce.

Instructions:

Preheat oven to 450 degrees. Let one disk of chilled pie dough rest on the counter for 15 minutes.

Roll out the pie dough on a floured surface to about a 12 inch circle. Transfer to a 9" pie pan. Don't stretch the dough. 

Pour filling into pie crust.

Sprinkle on a layer of crumble completely over the filling mixture. Then put an additional layer around the outer edge, so that you have a raised circle of crumble, about an inch thick, near the crimped edge of the pie crust. 

Optional: Brush the crimped edge of the crust with egg wash.

Bake uncovered at 450 degrees for 10 minutes. Then turn the temperature down to 350 degrees and cook for 30-35 minutes. After about 15 minutes, check to see if the crimped edge needs to be covered. Check after another 10 minutes to see if the whole pie should be tented with foil to prevent too much browning.

After removing the pie from the oven, spoon microwaved Caramel Sauce onto the top of the pie, but not onto the outer ring of crumble.

Cool for 1 hour to allow the filling to set.

This turned out pretty good, it just didn't have the depth of the Icelandic pie. So next time, try two cans of pie filling and a whole box of pudding. 

To try and get the bottom of the pie cooked more, try:

• Use a Hot Baking Sheet: Preheat a heavy baking sheet (lined with foil for easy cleanup) on the lowest rack. Place the pie on the hot sheet.