Preheat oven to 350 degrees F.
In a large bowl, use an electric mixer to cream together butter and sugar until light and fluffy (about 2-3 minutes).
Add egg and molasses. Mix until combined.
In a separate bowl, sift together flour, baking soda, salt, cinnamon, cloves, and ginger. Add dry ingredients to butter mixture and blend until combined.
Stir in oatmeal.
Drop dough by rounded tablespoons onto baking sheets that have been lined with parchment paper or silicone mats. The cookies will spread in the oven, so I recommend only placing 9 cookies on each baking sheet.
Bake for approximately 8-10 minutes, or until golden brown. The cookies will still look soft, which is fine. They will firm up a little bit as they cool, but they will still be soft and chewy!
Cool on the baking sheets for 5 minutes, then remove to wire racks to cool completely.