Caramel Hazelnut Linzer Cookies

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Ingredients

2/3 cup (65g) hazelnuts (raw, roasted, chopped, or whole)*
2/3 cup (135g) packed light or dark brown sugar, divided
2 and 1/2 cups (313g) all-purpose flour (spooned & leveled), plus more for rolling
1/2 teaspoon baking powder
1 teaspoon ground cinnamon
1/2 teaspoon salt
1 cup (16 Tbsp; 226g) unsalted butter, softened to room temperature
1 large egg, at room temperature
1 and 1/2 teaspoons pure vanilla extract
optional for dusting: 2 Tablespoons (16g) confectioners’ sugar
1 cup (200g) granulated sugar (make sure it’s labeled “pure cane”)*
6 Tablespoons (85g) unsalted butter, room temperature cut up into 6 pieces
1/2 cup (120ml) heavy cream, at room temperature
1/2 teaspoon salt

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