Caramel Apple Crumble

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For the crust:

1 1/2 sticks (12 tablespoons) unsalted butter, melted, plus more for the dish

2 cups old-fashioned oats

1 cup all-purpose flour

1/2 cup packed light brown sugar

1 tablespoon ground cinnamon

1 tablespoon pure vanilla extract

Pinch of kosher salt

For the filling:

4 Granny Smith apples, peeled and chopped into small pieces

1/4 cup granulated sugar

1 1/2 teaspoons ground cinnamon

50 chewy caramels, unwrapped

1 cup heavy cream

For the streusel:

1 cup all-purpose flour

3/4 cup coarsely chopped macadamia nuts

1/2 cup packed light brown sugar

1 stick unsalted butter, melted

1/2 teaspoon ground cinnamon

Pinch of kosher salt

Vanilla ice cream, for serving