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Preheat your oven to 350 degrees.
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Line 2 muffin/cupcake pans with liners.
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In a bowl blend sugar and butter.
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Add eggs, one at a time, mixing thoroughly each time.
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Add vanilla and mix to combine.
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In a separate bowl, combine flour, baking powder and salt.
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Slowly mix flour mixture into butter/sugar mixture.
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After flour has been combined, gently stir in greek yogurt and diced apples.
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In a separate bowl, combine brown sugar and cinnamon.
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Spoon batter into muffin liners ⅔ full.
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Sprinkle with brown sugar and cinnamon mixture.
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Bake at 350 degrees for 17 minutes, or until a knife is inserted and when removed is clean.