Preheat your oven to 180 C (350 F). Grease a cookie sheet or line the sheet with parchment paper.
In a mixing bowl, cream together the butter, brown sugar, and white sugar. Mix in the eggs and vanilla extract.
In another mixing bowl, add the flour, baking soda, salt, ground cinnamon, and ground nutmeg. Mix together.
Add the wet ingredients to the dry and mix together.
Add the raisins and walnuts and fold in.
Add the oatmeal and mix that in.
Scoop the dough and drop by large tablespoonfuls onto the prepared baking sheet. Bake for 10-12 minutes or until the just the edges are browned.
Remove from the oven and let cool on the sheet for several minutes.
After a few minutes, remove the cookies to a rack to cool completely. The cookies are very soft when you remove them from the sheet, they will set up as they cool.
Serve and enjoy.