Summer Berry Trifle

Name: Summer Berry Trifle
Prep time: 25 min
Total time: 25 min
Yield: 8-10
Ingredients: ¾ cup (8 oz) seedless raspberry jam; 1 quart (1½ pounds) strawberries, hulled and cut into ¼-inch slices; 1 pint (12 oz) raspberries; 1 pint (12 oz) blueberries; 1½ cups heavy whipping cream, cold; 16 ounces cream cheese (preferably Philadelphia brand), at room temperature; 1¾ cups confectioners' sugar; 1 teaspoon vanilla extract; 1 (7 oz) package crisp lady fingers (also called savoiardi biscuits); Fresh mint spring, for garnish (optional)