Prepare the Dough: In a large bowl, cream together the butter, granulated sugar, and brown sugar until light and fluffy. Beat in the egg, vanilla extract, and molasses until well combined.
Mix Dry Ingredients: In a separate bowl, whisk together the flour, oats, baking soda, cinnamon, and salt. Gradually add the dry ingredients to the wet ingredients, mixing until a dough forms.
Chill: Cover the dough and refrigerate for 30 minutes to make it easier to handle.
Preheat and Shape: Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper. Roll the dough into small balls (about 1.5 tablespoons each) and place them on the sheet, spacing them 2 inches apart.
Bake: Bake for 10–12 minutes, or until the cookies are golden around the edges. Allow them to cool on the baking sheet for 5 minutes before transferring them to a wire rack to cool completely.
Make the Strawberry Glaze: In a medium bowl, whisk together the powdered sugar, freeze-dried strawberry powder, milk, and food coloring (if using) until smooth. Adjust the milk to achieve your desired consistency.
Ice the Cookies: Dip the tops of the cooled cookies into the glaze or drizzle the glaze over them. Let the glaze set for about 20 minutes before serving.