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Preheat oven: Set to 180°C (350°F).
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Mix ingredients: Combine flour, protein powder, cinnamon, and baking powder. Add grated apple, egg, milk, and honey.
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Pour into muffin tins: Grease the tin or use muffin liners.
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Bake: For 20-25 minutes or until golden brown.
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Cool: Let them rest before serving.