1Heat oven to 425°F. In medium bowl, beat flour, milk, eggs and vanilla with wire whisk until combined.
2In 9 1/2-inch glass deep-dish pie plate, melt butter in oven. Using oven mitts, carefully tilt pie plate to coat bottom with melted butter. Slowly pour batter into hot plate. Bake 18 to 20 minutes or until puffed and deep golden brown (do not underbake).
3Meanwhile, in small bowl, mix cheese and powdered sugar; set aside. In 1-quart saucepan, cook and stir rhubarb, granulated sugar, water and cornstarch over medium-low heat until rhubarb is tender, about 4 minutes. Cool slightly. Stir in raspberries.
4Remove pancake from oven. Carefully spread cheese filling over bottom of pancake. Cut into quarters. If necessary, run spatula under pancake to loosen. Top with fruit filling.