Preheat oven to 375.
In a sauté pan over medium high heat, add butter and sauté onion until lightly browned, about 6 minutes. Add pancetta, red pepper and thyme and lightly brown, about 4 minutes. Scatter mixture over pie shell.
Meanwhile, in a bowl, add eggs and yolks, milk, cream or half and half, salt and pepper and mix well and pour over vegetables. Scatter cheese over top of quiche and place on bottom rack in oven. Bake for 30-35 minutes or until lightly browned and puffed. Remove and allow to set for 5 minutes before serving.
Can be served hot or room temperature.
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