Beat eggs in a bowl, add vanilla and raisins. Mix well, cover and refrigerate for at least an hour.
When ready to start, preheat oven to 350°
Cream softened butter and both sugars in a mixer (or with a hand mixer).
Combine dry ingredients in a separate bowl.
Add flour mixture, one cup at a time, to the mixer until thoroughly combined.
Add egg mixture to the mixer and beat well.
Add oats and mix slowly until just combined.
Scoop onto lined baking sheets, 2 inches apart.
Bake for 10-12 minutes.
Cool and store in an air tight container for up to a week.