Preheat the oven to 350°F (180°C). Place the pie crust in a 9-inch pie pan and prick the bottom lightly with a fork.
Heat butter or olive oil in a skillet over medium heat. Sauté the onion, garlic, and red bell pepper until softened, about 3 to 5 minutes, then let cool.
In a large bowl, combine the cooked shrimp, sautéed vegetables, shredded cheese, cream, eggs, chopped parsley, salt, and pepper. Mix gently to combine.
Pour the filling evenly into the prepared pie crust.
Bake the pie for 25 to 30 minutes, or until the filling is set and the top is lightly golden.
Remove from oven and let cool slightly before slicing.
Serve warm as a main dish or with a fresh salad.