Gather Ingredients: Flour, cocoa powder, sugar, butter, egg, and vanilla.
Make Dough: Mix dry ingredients, then add butter, egg, and vanilla.
Roll and Cut: Roll dough and cut into circles using a cookie cutter.
Bake: Bake at 350°F (175°C) for 8-10 minutes.
Prepare Filling: Beat butter, powdered sugar, and vanilla until creamy.
Cool Cookies: Let the baked cookies cool completely.
Assemble OREOs: Spread filling on one cookie and top with another.
Press Together: Gently press cookies together to seal the filling.
Enjoy: Indulge in your homemade OREOs or store them for later!