Melt 2 sticks butter over medium heat until browned, then cool. Beat the browned butter, 3/4 cup dark brown sugar and 3/4 cup granulated sugar until fluffy; beat in 1 teaspoon vanilla and 2 eggs. Whisk 2 1/2 cups flour, 3/4 teaspoon baking soda and 1 teaspoon salt, then stir into the butter mixture. Add 3/4 cup oats and 1 cup golden raisins and chill 30 minutes. Drop by tablespoonfuls and bake 12 to 15 minutes at 350 degrees.