Preheat oven to 350°F, and lightly grease a 9x13-inch baking pan.
In a large pot of boiling water, blanch the green peppers for 8 minutes; drain well and set aside.
In a large frying pan, heat the oil over medium-high heat.
Add the onion, garlic and ground beef.
Sauté, stirring constantly, until the meat is well browned.
Stir in the rice, Parmesan cheese, parsley and 1⁄2 can of the undiluted soup; combine thoroughly.
Season to taste with the salt and pepper.
Using a teaspoon, stuff the peppers with the rice/beef mixture.
Arrange in the prepared baking pan, open ends up.
In a small bowl, combine the remaining 1⁄2 can of tomato soup with 3⁄4 cup water; mix well.
Pour over and around the peppers.
Bake, uncovered, at 350°F for 35 minutes, or until the peppers become soft.
Baste occasionally with the pan liquid.
Serve immediately.