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Preheat the oven to 350F. Line one or two baking sheets with parchment paper.
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Combine the flour, rolled oats, baking soda, baking powder, salt, chai spice blend, and cinnamon in a bowl. Set aside.
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In a large bowl, cream the softened butter with the two sugars. You can use a hand held mixer or stand mixer, but I have even found that a little elbow grease and a spatula will work. You want the mixture completely blended, light and fluffy.
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Slowly add in the eggs and then the vanilla.
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Use a large spoon to add in the dry ingredients, working with a little at a time, till all the dry ingredients are in the bowl. Once just combined, stop.
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Fold in the apple chunks and chopped walnuts (if using) gently. At this point the dough will be sticky. Chill for 30-60 minutes.
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When ready to bake, scoop out portions between 1-2 tablespoons onto the baking sheet. Space the cookies out a good two inches.
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Bake between 10-13 minutes, depending on the size of the cookies, and your oven. You are looking for the cookies to be golden brown around the edges, and the middles to be just set.
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Transfer the baking sheet to a wire cooling rack, and let the cookies cool for about five minutes. Then they should be firm enough to move directly to the cooling racks using a spatula, to cool completely.
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They will keep in a sealed container for up to five days, or in the fridge for a week.