Step 1

Heat oven to 450ºF.

Step 2

Use pulsing action of food processor to chop mushrooms until finely chopped. Heat dressing in large nonstick skillet on medium-high heat. Add mushrooms; cook and stir 2 min. Add shallots; cook 2 min. or until liquid is cooked off. Spoon into bowl; stir in cheese and parsley.

Step 3

Sprinkle both sides of steaks with crushed peppercorns. Carefully wipe skillet clean with paper towel. Heat oil in skillet on medium-high heat. Add steaks in batches; cook 1 min. on each side. Remove from skillet; cool 5 min.

Step 4

Unfold pastry on lightly floured cutting board; roll to 20x12-inch rectangle. Cut into 6 squares. Spoon mushroom mixture onto center of each square; top with steak. Bring edges of pastry together, then pinch together at top to seal. Place, upside-down, on rimmed baking sheet sprayed with cooking spray.

Step 5

Use sharp knife to cut slits in star-shaped design in top of each pastry bundle. Brush with egg.

Step 6

Bake 10 to 14 min. or until pastry is golden brown and steaks are cooked to medium doneness (160ºF). Remove from oven. Let stand 7 to 10 min. before serving.