1. In a large mixing bowl, cream the Butter, Sugar, Brown Sugar, and the Peanut Butter till it is smooth and creamy.

2. Add the Egg and Vanilla and mix it well.

3. Add the Baking Soda, Salt, Cinnamon, Oats, and Flour. Mix it until it is well mixed.

4. Place the dough in the refrigerator and chill the dough for 3-4 hours.

5. Make the Ganache ahead of time so that it is thickened by the time your cookies are done baking. Make the Ganache by heating the cream until it is boiling. You can do it in the microwave or on the stove. Add the Chocolate and stir it until the chocolate is melted and it is creamy. Let it cool to thicken.

6. Preheat the oven to 375°F.

7. Grease your baking sheet. Roll the cookies into balls. Roll the balls of dough in sugar and place them on your baking sheet.

8. Bake the cookies for 7-8 minutes, or until they are lightly golden brown. Let them cool for a few minutes on the pan before moving them.

9. Let the cookies cool on a cooling rack until they are completely cooled. Spread the Ganache on the bottom side of half the cookies. Then place the other half of the cookies on top of the ganache to make a sandwich.

10. Serve and enjoy!