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With electric mixer, beat butter at high speed until fluffy and light coloured.
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Add sugar and beat until even fluffier.
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Add egg and vanilla, beat until batter is smooth.
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In separate bowl, whisk together oats, flour, baking soda and salt.
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Pour half of dry ingredients over the batter and stir with wooden spoon until there is no streaks.
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Stir in remaining dry ingredients.
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Stir in raisins.
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Scoop dough by level tablespoonfuls and drop onto lightly greased baking sheets.
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Making sure to leave about 2-inch space between cookies.
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Bake in oven preheated to 350°F for 8 to 10 minutes or until cookies are golden brown around edges.