Preheat oven to 350 degrees F. Line two baking sheets with parchment paper, set aside.

In a large bowl, using a spatula, cream together butter, sugar, and salt. Add egg, vanilla, and 1/4 cup water; mix until well combined.

In another large bowl, mix together flour, oatmeal, cinnamon, baking powder, baking soda, and nutmeg. Fold into the butter mixture until well combined. Add raisins and stir until well combined.

Using a 1 1/2-inch ice cream scoop, scoop out cookie dough onto prepared baking sheets, about 1 1/2 inches apart. Transfer baking sheets to oven, and bake until edges begin to brown, about 20 minutes.

Let cookies cool on baking sheet for about 10 minutes before transferring to a wire rack to cool completely.