1. Flatten biscuits with hand. Wrap each biscuit around an apple half; place seam side down in a greased 13x9x2 inch baking dish.
2. Combine sugar, water, butter and vanilla; pour into pan. Sprinkle cinnamon over dumplings.
3. Bake, uncovered, at 350°F for 35-40 minutes or until golden brown and apples are tender. Serve immediately.