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Beat butter and sugars until light and fluffy.
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Beat in the egg and vanilla.
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Sift over the flour and raising agent then tip in the oats - mix until rubble.
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Tip in the choc, cranberries and nuts if using and mix until just combined and the ingredients well dispersed throughout the dough.
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Preheat oven to 180˚C.
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Line a baking tray with a silicone reusable liner for preference.
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Scoop out tbsp sized balls of dough and space out well on the tray.
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Slap the tray down once sharply onto the work top to flatten ever so slightly.
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Bake for approx 12-15mins, taking out half way and repeating the slapping down of the tray (don't go too mad - you don't want to break up the cookies nor have them fly about your kitchen!).
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When golden around the edges and barely set in the middle remove from the oven and wait just long enough for them to start firming up before transferring to a rack to cool fully.
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(Leaving cookies on a hot tray longer than this can result in them over cooking and becoming crisp and flaky rather than chewy and soft in the middle).