Preheat the oven to 350°. Cover a cookie sheet with parchment paper.
Whisk together flour, cinnamon, baking soda, and salt.
Add egg, sugar, melted butter, molassas, and milk to the same bowl. Combine thoroughly using a wooden spoon. Add the oats and mix well. Dough will be stiff. Fold in choclolate chips and anything else you're adding.
Drop heaping tablespoonsful of dough on the cookie sheet, spacing them a couple of inched apart. Bake for 13 minutes, or just until you begin to see a little browning around the edges. Cool completely before storing in an airtight container. These cookies freeze beautifully.
