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Place mixed berries in a small bowl and crush slightly with the back of spoon.
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Stir in 3 tablespoons sugar.
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Cover with plastic wrap and set aside.
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Spray four 3/4 cup ramekins with cooking spray.
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In a small bowl, pour 1 tablespoon milk.
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Sprinkle gelatin over and allow it to soften (10 minutes).
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Meanwhile, combine cream, 1/3 cup milk, vanilla, and 1/4 cup sugar in a saucepan.
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Bring to a boil over medium high heat, stirring often.
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Remove from heat, add gelatin mixture and stir until melted.
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Let the mixture cool slightly down to a warm temperature.
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In a medium sized bowl, whisk together mascarpone cheese and sour cream until smooth.
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Slowly add the now warm cream mixture into the bowl, whisking constantly.
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Pour mixture into prepared ramekins.
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Chill until cold and set (at least 3 hours and up to 12) Run a small knife around the edge of the ramekins to loosen the panna cotta.
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If that doesn't work, dip the bottom of the ramekin in hot water for a few seconds.
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Invert ramekin onto a plate.
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Spoon berry sauce over panna cotta.
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Serve.