Prep Time: 10
Cook Time: 35
Serves: Serves: 6
Melt butter in large skillet over medium heat; add onion; cook 5 minutes, stirring occasionally. Add bell pepper, mushrooms and asparagus, if desired; continue cooking 5 minutes, stirring occasionally. Stir in salt and cayenne pepper.
Beat eggs and half-and-half together in medium bowl; stir in vegetable mixture. Lightly coat 10-inch quiche dish or deep-dish pie pan with cooking spray. Pour egg and vegetable mixture into pie pan. Sprinkle cheese over top; bake in preheated 350°F oven 35 minutes or until eggs are set.