Oat and Pecan Brittle Cookies

Name: Oat and Pecan Brittle Cookies
Ingredients: 1¼ cups (142 g) coarsely chopped pecans; ¾ cup (150 g) granulated sugar; 4 Tbsp. (½ stick) unsalted butter; ½ tsp. baking soda; ½ tsp. Diamond Crystal or ¼ tsp. Morton kosher salt; 1 cup (2 sticks) unsalted butter, cut into 16 pieces, divided; 1⅓ cups (173 g) all-purpose flour; 2 tsp. Diamond Crystal or 1 tsp. Morton kosher salt; 1 tsp. baking soda; 2 cups (200 g) old-fashioned oats, divided; ¾ cup (packed; 150 g) dark brown sugar; ½ cup (100 g) granulated sugar; 2 large eggs; 1 Tbsp. vanilla extract