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Preheat the oven to 375 degrees F.
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Grease a nonstick muffin pan or line with paper liners.
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In a large bowl, combine the flour, baking powder, baking soda and salt.
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In a separate bowl, whisk together the sugar, milk, yogurt, egg, butter and vanilla.
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Pour over the dry ingredients and stir just until moistened.
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Spoon enough batter into the prepared muffin pan to fill the cups just under half full.
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Spoon about 1/2 teaspoon of jam in the centre of each cup and top with the remaining batter.
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Bake for 25 to 30 minutes or until the tops are firm to the touch.
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Let cool in the pan for 5 minutes.
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Transfer to a rack.
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Warm the remaining jam in the microwave for 30 seconds and then brush over the tops of the muffins.
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Let cool completely.