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Preheat oven to 325 degrees. Line two baking sheets with Silpat or parchment paper.
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Beat butter and sugars until light and fluffy. Add egg, vanilla extract, orange oil (or extract) and mix well.
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Add one cup of the flour, along with the baking soda and salt and mix well. Add remaining 1/2 cup flour and mix until incorporated. If necessary, add more flour until the dough is thick and doesn't stick to your fingers when you pinch it.
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Add white chocolate chips and macadamia nuts and mix until evenly distributed.
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Using a large cookie scoop, place dough two inches apart on baking sheets. Using your fingers, press the sides of the dough in to make the unbaked cookies look like tall rectangles or small pillars. (You just want them taller than they are wide. This will ensure that the cookies maintain a soft, chewy center).
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Bake for 12 minutes, until edges just start to brown. Remove from the oven, even though the cookies will look puffy and slightly undercooked. They will finish cooking on the pan outside the oven. After about 10 minutes, transfer to a wire rack to cool completely.