I don’t have a particular recipe for this one (usually I just use the recipe on the back of the flour or box of raisins) but the site that I reference for many of the things I bake is AllRecipes, which is one of the best web sources for baking recipes as well as recipes for meals. Here’s the link for those that are interested in using it:
Typical ingredients for oatmeal raisin cookies are:
-and baking/instant oats
Usually, you don’t want to used instant oats (the consistency tends to be mooshy, so, if you can manage to find oats for baking, that’s good) there’s not necessarily anything wrong with instant oats, just make sure you’re using a recipe that calls for them because it most likely will give you the correct amount of ingredients to balance it out.