Prepare all ingredients. Combine the dry ingredients for the dough. Rub the oil with the egg, and combine both masses with a stand mixer. Preheat oven.
Add chopped almonds. Form cookies and arrange on a baking tray lined with parchment paper. Bake in the oven at 180 degrees for about 20 minutes. Cool completely.
Mix everything for the filling. Cool down.
Put a little stuffing on one cookie, and cover it with the second one slightly at an angle. Make teeth and eyes from marshmallows.
Notes
Alternative Filling: If you don't want to scratch make the filling for these sugar cookies, you can simply use some royal icing.Rising Solution: If your cookies seem too flat, you can add a pinch of baking powder or baking soda to help the cookies rise.Decorative Variations: I've used marshmallows to make the teeth and eyes for the monster cookies, but you can use candy eyeballs and candy corn too, if you have those at hand. You'll find candy eyes and candy corn at most food specialty stores or supermarkets close to Halloween season.Flavor Enhancement: To lend some extra flavor to this chocolate cookie, you can use brown sugar instead of regular sugar.