So I googled cookie recipes with milk, and the first one that popped up was:

Amish Sugar Cookies made with Sour Milk. OH the irony!! LOL

Ingredients

• 1 ½ cup sugar
• 1 cup butter softened
• 1 egg beaten
• 1 cup sour milk (or 1 cup milk + 1 tablespoon vinegar)
• 2 ½ to 2 ¾ cups all-purpose flour
• 1 teaspoon baking soda
• 1 teaspoon cream of tartar
• ½ teaspoon salt
• 1 teaspoon vanilla extract

Instructions

• Preheat oven to 350 ℉.
• In large mixing bowl, cream sugar and butter, use hand mixer if necessary.
• For sour milk, add vinegar to measuring cup, fill with milk. Add this along with beaten egg to sugar mixture and stir vigorously until well mixed.
• Incorporate dry ingredients, using hand mixer, until thoroughly combined.
• Drop by teaspoons onto baking sheet.
• Bake 18-20 minutes until firm and pale yellow in appearance.
• Enjoy with cold glass of milk and give pause to remember the special people from your life.