½ pound (2 sticks) unsalted butter, at room temperature
1 cup granulated sugar
½ cup dark brown sugar, packed
2 large eggs at room temperature
1 teaspoon vanilla extract
3 cups old-fashioned rolled oats
1 cup (6 ounces) raisins
Cookie sheets (not insulated); baking parchment or Silpat or other nonstick baking mats (optional); flat paddle attachment for electric mixer (optional)
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