Preheat oven to 400°. Combine first 4 ingredients in a medium saucepan. Cook over medium-high heat 5 minutes or until bubbly and sugar dissolves. Remove from heat.
Separate biscuits, and flatten each into a 3 1/2-inch circle. Cut with a 3-inch star-shaped cutter, and place on a lightly greased baking sheet; sprinkle with sparkling sugar, pressing to adhere. Bake at 400° for 8 minutes or until lightly browned.
Place 1 biscuit on each serving plate. Spoon blueberry mixture over half of biscuits; top with remaining biscuits. Serve with whipped cream.
Note: We tested with Pillsbury Grands! Jr. Golden Layers Buttermilk Biscuits.