PREHEAT oven to 350° F. Spray 10, 2 1/2-inch muffin cups with nonstick cooking spray. Soften tortillas by heating in microwave on HIGH (100%) power for 10 seconds. Press tortillas into muffin cups to form quiche crusts.
WHISK evaporated milk, egg substitute, spinach, ricotta and Swiss cheeses, salt and pepper in medium bowl until blended. Spoon about 1/2 cup of mixture into prepared quiche bases, dividing evenly. Stir mixture frequently to evenly distribute ingredients.
BAKE for 30 to 35 minutes or until knife inserted near centers comes out clean and tortilla edges are lightly browned. Cool in pan for 5 minutes. Carefully remove quiches. Serve warm.
• 1/2 cup finely chopped ham maybe added to the milk mixture.
• Quiche cups can be made ahead and frozen. To reheat, place on baking sheet and bake in preheated 325º F oven for 25 to 30 minutes or, place in 2 to 4 quiche cups on microwave-safe plate and microwave on MEDIUM-HIGH (70%) power for 2 1/2 to 5 minutes or until hot.