Iced oatmeal cookies are soft and chewy cookies filled with cozy spices, topped with a vanilla icing. These old-fashioned oatmeal cookies are the perfect cozy cookie everyone will love!
In a large mixing bowl, whisk in the cooled melted butter with the light brown and granulated sugars until well combined. Whisk in the egg, egg yolk, molasses vanilla extract until smooth and well combined.
Stir the dry ingredients into the wet a little at a time until just combined. Using a medium cookie scoop (2 tablespoons, 30 ml), scoop the oatmeal cookie dough and place the cookie dough balls onto the lined baking sheet about 3 inches ( 8 cm) apart.
Bake at 350 F (177 C) for 10 -12 minutes or until the edges of the cookies are set and the centers are slightly puffed.Cool the chewy oatmeal cookies on the baking sheet for 3 - 4 minutes.
Whisk milk or water into the powdered sugar until smooth and well combined. Add more liquid for a thinner glaze or more powdered sugar for a thicker icing.
Dip the top of each cookie in the icing. Gently shake the excess icing off the cookie. Return the cookie with icing to the cooling rack to fully set and enjoy!