In medium bowl, beat the sour cream, cream cheese and vanilla with a whisk until creamy. Stir in the marshmallow crème. Spoon about 2 tablespoons of the sour cream mixture into each of 4 (6 ounce) dessert glasses. Top with a layer of brownie cubes and berries. Evenly divide remaining the sour cream mixture among the glasses. Divide remaining berries among the glasses.