These cookies look a little like Oreos or possibly moon pies. They’re more like Oreos in flavor, only a bit softer and they don’t have that weird chemical burn Oreos can have – they taste of chocolate cookies and creamy filling.
Cream together butter, sugar, egg and vanilla until light and fluffy.
Add flour, cocoa, baking soda and salt all at once. Mix until just well combined.
Divide dough in half. Shape each half into a 1 inch diameter roll and wrap in plastic wrap or waxed paper. You may need to refrigerate it a while to make it easier to shape.
Refrigerate 4 hours or overnight until it’s firm enough to slice. Heat oven to 375.
Slice rolls 1/8 inch thick and place slices about 2 inches apart on an ungreased cookie sheet. They’ll spread a little more than you may expect – don’t place them too close together.
Bake 8-10 minutes at 375. Remove cookies from pan and cool completely on a wire rack.
For filling, beat together all ingredients until uniform.
Make sandwiches of the cookies, either by spreading a bit of filling on the bottom of one cookie then sticking it to the bottom of another or by squishing a small marble size ball of filling between the two.
Store the cookies covered in the fridge, since the creamy filling contains butter and is perishable.