Homemade Little Debbie Copycat Fudge Rounds

1. Whisk melted butter and both sugars until smooth. Add egg and vanilla. 2. Stir in flour, cocoa powder, baking soda, and salt until almost combined. Add milk and mix until a soft dough forms. 3. Scoop onto a large parchment lined (important) baking sheet and freeze 15 minutes. 4. Flatten slightly using a cup before baking. 5. Bake at 350°F for about 12 minutes. Centers should look soft. 6. Let cool on the baking sheet at least 10 minutes before moving (I like to pop them in the freezer or fridge). 7. Drizzle melted milk chocolate over the tops and let set. 8. Beat filling ingredients until light and fluffy, then sandwich between cookies.