Prepare 3 large zucchini by slicing in half lengthwise and scooping out the center, leaving about ½-inch of flesh in the skin.
Microwave the hollowed out zucchini skins for 3-4 minutes and set aside.
Make the filling
Finely dice 1 onion and 1 red bell pepper and mince 1 clove garlic.
Sauté onion and pepper in 1 tablespoon olive oil until tender. Add garlic and 1 pound cooked ground beef and continue cooking over medium heat until heated through.
Add 1 teaspoon Italian seasoning, 1 teaspoon dried basil, and 1 teaspoon salt and mix well. Remove from heat.
Add ¾ cup grated Parmesan cheese and ¼ cup chicken broth. Mix gently.
Add 1 cup cooked rice and mix gently until mixture is of uniform consistency.
Stuff the zucchini & bake
Prepare a baking dish or sheet with parchment paper or non-stick baking spray.
Divide beef mixture evenly between prepared zucchini boats and place each into the baking dish.
Bake uncovered at 375ºF for 25-30 minutes or until heated through and starting to brown on top.