Preheat oven to 350 degrees. Grease an appropriately sized baking dish with oil and set aside.
Heat a nonstick pan on medium heat. Add oil, diced onion, asparagus, and sliced mushrooms. Saute for 4-5 minutes over medium heat. Remove from burner and allow to cool.
In a large bowl combine the eggs with the cream and add in salt and pepper.
Pour egg mixture into greased pie dish. Gently transfer sauteed veggies, tomato and cheese into dish, evenly distributing.
Bake for 30-35 minutes, or until the center of the dish is set. Allow the dish to cool for 10 minutes before cutting and serving. Serve with toast and plums
While the quiche is baking, heat a nonstick pan on medium heat and brown the chicken sausage on both sides. Serve on the side of the quiche.