Pre-heat the oven to 375°F.
In a medium size skillet, heat the EVOO, one turn of the pan, over medium-high heat. Add the sausage and cook, breaking up the meat, until browned; let cool. Add the sausage to the piecrust and scatter the cheese on top.
In a medium size bowl, beat together the eggs, half-and-half and parsley and pour over the sausage and cheese. Bake for 40 minutes; let cool.
Season with salt and pepper and top with the chili sauce.