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Preheat oven to 350 degrees F.
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Line an 8x8 baking pan with aluminum foil so it hangs over the edges.
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Use a food processor to grind the graham crackers into a fine crumb. Add the butter and pulse until combined. Press into the lined pan. Bake for 8 minutes.
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Meanwhile, beat the cream cheese for 1 minute. Then, beat in the yogurt, egg whites, sugar, and flour until creamy, about 3 minutes. Add the lemon juice and vanilla, beat for another minute.
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Add the filling to the crust.
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Heat the jam in a microwave safe bowl for 15 seconds-- this will make it easier to swirl. Drop the jam by the spoonful on top of the filling and swirl with a pointy knife.
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Bake for 25 minutes, covering with foil at 20 minute mark.
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Cool on the counter for 30 minutes before refrigerating. Chill in the fridge for at least three hours.
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When ready to serve, melt the baking chocolate in a bowl and drizzle over the bars. Top with a fresh raspberry and mint sprig!