Heat oven to 350°F; line two sheets with parchment.
Beat butter and both sugars in large bowl 2-3 minutes until creamy and smooth.
Beat in eggs and vanilla thoroughly.
Separately whisk flour, baking soda, cinnamon, and salt.
Gradually stir dry into wet just until combined.
Fold in oats and raisins evenly.
Drop heaping tablespoons about 2 inches apart on sheets.
Bake 11-13 minutes until edges lightly golden and centers slightly soft.
Cool on sheet 5 minutes; transfer to rack to cool completely. Store airtight up to a week.