Homemade Oreos - Cook with Carla

Ingredients

• Softened unsalted butter, 1 cup (used for cookies)
• Sugar, granulated, 3/4 cup
• Dark brown sugar, 3/4 cup
• 1 large egg
• All-purpose flour, 1 2/3 cups
• Unsweetened cocoa, 2/3 cup
• Salt, 1 teaspoon
• Baking soda, 1/2 teaspoon
• More softened butter (3/4 cup) for the filling
• Powdered sugar (confectioners'), 2 cups
• Milk, 1 tablespoon
• Vanilla extract, 1/2 teaspoon
• Kosher salt, 1/2 teaspoon (used in filling)