HEAT oven to 375°F.
COOK vegetables in skillet sprayed with cooking spray on medium heat 5 min. or until crisp-tender, stirring occasionally. Remove from heat.
BEAT eggs, mayo and milk in medium bowl with whisk until blended. Stir in vegetables and cheese; pour into pie crust. Place on baking sheet.
BAKE 40 to 45 min. or until center of quiche is set and top is golden brown. Let stand 10 min. before slicing to serve.