Sprinkle gelatin over 1/2 cup of the half-and-half in medium saucepan. Let stand 5 minutes to soften. Stir in remaining 1 cup half-and-half, sugar and vanilla; mix well. Cook on low heat until gelatin is completely dissolved, stirring frequently. (Do not boil.)
Pour gelatin mixture into blender or food processor container. Add ricotta cheese; cover. Blend until smooth. Pour evenly into 8 (6-oz.) custard cups or soufflé dishes. Refrigerate 2 hours or until set.
Microwave jam in microwavable dish on HIGH 15 seconds. Spoon 1/2 tsp. of the jam over each dessert just before serving.