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Preheat oven to 350 degrees with rack in center of oven.
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Cream butter and sugars. Add eggs. Beat for about one minute.
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Add orange and vanilla extracts and set aside.
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In a small separate bowl, microwave the white chocolate chips for 30 seconds. Stir, heat for 30 seconds. Stir again. Microwave again for a few seconds. In my microwave this takes a total of 1 min 15 seconds. The chocolate will melt as you stir.
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When melted, scrape into bowl with butter and sugars. Mix with mixer until incorporated. Or, alternatively, you may just mix the chips into the batter.
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Add the flour, powder, soda, ginger, sea salt and cornstarch all at once. Mix just until flour disappears and ingredients are incorporated. Fold in Craisins.
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Spread mixture evenly in a greased 9x13 pan.
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Bake for 20-30 minutes, or until center is set and a toothpick inserted in center comes out with a few moist crumbs attached.
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Let cool completely.