Cookies 3/4 cup (1 1/2 sticks) unsalted butter, softened 2 cups packed brown sugar 2 large eggs 1/2 teaspoon salt 2 cups all-purpose flour 1 teaspoon baking powder 1 teaspoon ground cinnamon 1/4 teaspoon freshly ground nutmeg 2 cups quick-cooking rolled oats 2 teaspoons baking soda 3 tablespoons boiling water Filling (adapted from “The All-American Dessert Book”) 1 tablespoon plus 1 teaspoon unflavored gelatin (about 1 1/2 packets) 1/3 cup plus 1/4 cup water (divided) 3/4 cup granulated sugar 1/2 cup light corn syrup 2 teaspoons vanilla extract 1 cup powdered sugar 8 ounces vegetable shortening Preheat the oven to 425 degrees F. Lightly grease a baking sheet and set aside (I prefer to use parchment paper as it saves me from doing even more dishes!). Cream the butter, sugar, and eggs in a large bowl. In a separate bowl, sift together the salt, flour, and baking powder. Add to the creamed mixture. Add the cinnamon, nutmeg and oats. Mix well. In a small dish, add the baki...