Put blueberries on a foil lined baking sheet. Top with chopped apples and bleu cheese.
Cook at 400 for about 10 minutes. Turn broiler on for last few minutes if necessary to get everything melted.
Put greens in a salad bowl and top with grapes and pecans.
Slide hot melted blueberry mixture from pan directly on top of salad. Toss gently. Taste and season if necessary.