Cook butter in a light-colored skillet over medium heat until golden brown, stirring. Cool 10 minutes.

Heat oven to 350°F. Line baking sheets. Whisk butter and sugars; beat in eggs and vanilla.

Mix flour, baking soda, cinnamon and salt; stir into butter mixture. Fold in oats and raisins.

Drop 2-tablespoon portions 2 inches apart. Bake 10–12 minutes until edges set.

Cool on sheets 5 minutes; transfer to a rack.