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Gather the ingredients.
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Preheat the oven to 325 F.
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Stir together the oats, flour, cinnamon, cloves, allspice, baking powder, and salt in a large bowl.
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In a measuring cup, whisk together the maple syrup, egg, melted butter, and vanilla extract. Stir in the peeled and chopped apple.
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Slowly mix the wet ingredients into the dry ingredients until they are totally incorporated and the dry ingredients are completely moistened.
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Cover and let the dough chill in the refrigerator for about 20 minutes.
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Line a baking sheet with parchment paper. Scoop tablespoon amounts of dough onto the parchment paper. Flatten each round ball slightly.
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Bake for about 12 minutes.
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While the cookies are baking, whisk together the icing ingredients.
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Let the breakfast cookies cool on a wire rack and then drizzle them with the icing. Serve the breakfast cookies immediately or place in an airtight container and keep for a few days.