Oatmeal Raisin Cookie Pie

Name: Oatmeal Raisin Cookie Pie
Ingredients: One 9-inch refrigerated prepared pie dough, or your favorite single crust recipe; 1 tablespoon all-purpose flour, plus more for dusting; 3/4 cup packed light brown sugar; 10 tablespoons unsalted butter, at room temperature; 1 large egg; 2 teaspoons vanilla extract; 1 teaspoon ground cinnamon; 1/2 teaspoon freshly grated nutmeg; Kosher salt; 1 cup rolled oats, plus more for garnish; 3/4 cup dark and/or golden raisins; Vanilla ice cream or unsweetened whipped cream, for serving