Classic Chewy Oatmeal Cream Cookies

Ingredients

• 211g (2 1/4 cups) old-fashioned oats.
• 247g (1 3/4 cups) plain flour.
• 3/4 tsp baking soda.
• 1/2 tsp fine salt.
• 1 tsp ground cinnamon.
• 1/4 tsp nutmeg powder.
• 1/4 tsp optional ground ginger.
• 1 cup (2 sticks) soft unsalted butter.
• 1/2 cup white sugar.
• 1/3 cup packed light brown sugar.
• 2 tbsp molasses.
• 1 large egg.
• 1 egg yolk (large).
• 1 tsp vanilla flavoring.
• 8 tbsp soft unsalted butter (filling).
• 2 oz softened cream cheese (filling).
• 2 1/4 cups powdered sugar (filling).
• 1 tsp vanilla flavor (filling).