Spray 15 x 10-inch (37 x 25 cm) jelly-roll pan with cooking spray. Line with waxed paper and spray again; set aside.
Spray large skillet with cooking spray. Add vegetables and basil; sauté over medium heat until vegetables are tender-crisp. Set aside.
In small bowl, beat together egg yolks, flour, salt and pepper until blended. In a large bowl, beat egg whites until stiff, but not dry. Gently fold yolk mixture into whites. Spread mixture evenly into jelly-roll pan.
Bake in preheated 350°F (180°C) oven until firm to the touch, about 8 minutes. Invert onto clean waxed paper. Remove pan and peel off paper liner.
Increase oven temperature to 375°F (190°C). Spoon 3/4 cup (175 mL) milk evenly over egg layer. Spoon vegetables on top and sprinkle with 1/4 cup (50 mL) cheese. Starting with long side, roll jelly roll style.
Place seam-side down in a shallow baking pan. Drizzle with remaining milk. Sprinkle with remaining cheese. Bake 10 to 12 minutes. Cut into 12 slices.
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