Preheat the oven to 425° F. Line a baking sheet with parchment paper or silicone baking mat, or lightly spray it with non-stick cooking spray.
In a large bowl, whisk together the baking mix and the sugar. Add about half of the blueberries to the mixture and lightly toss.
Add 1/2 cup of whipping cream and the melted butter. Fold gently until the mixture is just combined and a dough forms. (Some of the berries will burst, don't worry.)
Turn the dough out onto the prepared baking sheet. Carefully press it into a rectangle that is about 10 inches by 7 inches. Pour the remaining berries on top of the dough and press them lightly into the dough. Using a paring knife, score the dough to make 12 to 15 biscuits.
Bake 15 to 17 minutes or until the biscuits are golden brown.
Make the glaze by combining the remaining 1/2 cup whipping cream with the 2 cups of powdered sugar. Mix well. Drizzle over the warm biscuits.