3. Pour butter mixture into dry ingredients and mix one more time.
4. Then in a baking tray lined with a baking paper, put small dough balls, press them a little with your hands.
5. Bake in a 180C (360F) preheated oven. When done - let cookies to chill.
6. For filling, melt white chocolate, pour melted butter and add condensed milk. Mix everything to combine. Then, while stirring, pour powdered sugar.
7. Then take one cookie, spread on it filling, and add on the top another cookie. When done, put in a fridge for about an hour. After that, you can enjoy your homemade "Oreo" cookies!