Iced Miso Oatmeal Cookies

Name: Iced Miso Oatmeal Cookies
Ingredients: 1 1/2 cups (125 grams) rolled oats; 1/2 cup (75 grams) all-purpose flour; 1 1/2 teaspoons ground cinnamon; 1/2 teaspoon baking soda; 1/2 teaspoon kosher salt; 1 stick (8 tablespoons/113 grams) unsalted butter, softened; 4 1/2 teaspoons white miso paste; 1/2 cup (100 grams) granulated sugar; 1/4 cup (50 grams) brown sugar; 1 large egg; 1 teaspoon vanilla paste or extract; 3/4 cup confectioners' sugar, plus more if needed; 2 tablespoons milk, plus more if needed; 1/2 teaspoon vanilla paste or extract